Citi's Equities Technology organization is seeking a hands on Senior Software Engineer to join the Equities Timeseries group, a strategic, horizontal platform organization responsible for order data, tick data, and real time and historical Transaction Cost Analytics (TCA) supporting global Equities trading. Within this broader Timeseries organization, the role will focus on strategic time series data platforms that provide the analytics, canonical data models, and performance critical infrastructure underpinning electronic execution globally, including Algorithmic Trading and Smart Order Routing (SOR). The successful candidate will play a senior technical leadership role in the design, implementation, and evolution of these platforms, contributing to architecture decisions under microsecond-level latency constraints, defining and governing time series data models, and ensuring the correctness, explainability, and performance of analytics used across Citi's electronic execution ecosystem. This role requires close, continuous collaboration with trading desks, product partners, and quantitative research teams globally, with strong alignment to firm wide strategy and cross regional delivery. Responsibilities: Design and develop next generation time series analytics platforms supporting multiple execution critical systems within the Equities Timeseries organization. Own and evolve high performance KDB+/q (or equivalent) platforms used for order, execution, market data, and TCA analytics, across both real time and historical use cases. Define, govern, and maintain canonical time series schemas and data models that are shared across Algorithmic Trading, SOR, and other electronic execution consumers. Contribute to architectural decisions for ultra low latency, high throughput systems, ensuring analytics can operate under microsecond level constraints. Partner closely with traders and quantitative researchers to co design and productionize analytics, translating research ideas into reliable, production grade time series systems. Drive high standards in code quality, automated testing, and SDLC discipline, with a focus on analytics correctness and repeatability. Continuously improve testing frameworks, development tools, and environments to support platform reliability at scale. Leverage Citi's AI powered SDLC tooling to enhance developer productivity, code quality, and innovation. Build and maintain shared platform capabilities for monitoring, reconciliation, traceability, recovery, and auditability of electronic trading analytics. Qualifications: Proven hands on engineering experience with deep technical expertise in low latency time series databases, using KDB+/q. Experience in Java, C++ will be desired. Deep expertise in KDB+/q or equivalent high performance time series platforms, with demonstrated ownership of production systems. Prior experience building or owning Algorithmic Trading, SOR, Market Making, or Quantitative Trading time series platforms at a global financial institution. Strong understanding of market microstructure, electronic execution workflows, and regional exchange and regulatory regimes. Proven ability to design and operate systems where analytics correctness is non negotiable, even under extreme performance constraints. Strong understanding of performance optimization, and high throughput architectures. Experience defining and governing shared data models used by multiple downstream systems. Ability to prioritize multiple initiatives and deliver in a fast paced, globally distributed environment. Excellent communication skills, with the ability to reason and explain complex systems to engineers, quants, and trading stakeholders. Education: Bachelor's degree / University degree in Computer Science, Engineering, or a related field, or equivalent professional experience. Job Family Group Technology Job Family Applications Development Time Type Full time Most Relevant Skills Please see the requirements listed above. Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi's EEO Policy Statement and the Know Your Rights poster.
Aug 24, 2026
Full time
Citi's Equities Technology organization is seeking a hands on Senior Software Engineer to join the Equities Timeseries group, a strategic, horizontal platform organization responsible for order data, tick data, and real time and historical Transaction Cost Analytics (TCA) supporting global Equities trading. Within this broader Timeseries organization, the role will focus on strategic time series data platforms that provide the analytics, canonical data models, and performance critical infrastructure underpinning electronic execution globally, including Algorithmic Trading and Smart Order Routing (SOR). The successful candidate will play a senior technical leadership role in the design, implementation, and evolution of these platforms, contributing to architecture decisions under microsecond-level latency constraints, defining and governing time series data models, and ensuring the correctness, explainability, and performance of analytics used across Citi's electronic execution ecosystem. This role requires close, continuous collaboration with trading desks, product partners, and quantitative research teams globally, with strong alignment to firm wide strategy and cross regional delivery. Responsibilities: Design and develop next generation time series analytics platforms supporting multiple execution critical systems within the Equities Timeseries organization. Own and evolve high performance KDB+/q (or equivalent) platforms used for order, execution, market data, and TCA analytics, across both real time and historical use cases. Define, govern, and maintain canonical time series schemas and data models that are shared across Algorithmic Trading, SOR, and other electronic execution consumers. Contribute to architectural decisions for ultra low latency, high throughput systems, ensuring analytics can operate under microsecond level constraints. Partner closely with traders and quantitative researchers to co design and productionize analytics, translating research ideas into reliable, production grade time series systems. Drive high standards in code quality, automated testing, and SDLC discipline, with a focus on analytics correctness and repeatability. Continuously improve testing frameworks, development tools, and environments to support platform reliability at scale. Leverage Citi's AI powered SDLC tooling to enhance developer productivity, code quality, and innovation. Build and maintain shared platform capabilities for monitoring, reconciliation, traceability, recovery, and auditability of electronic trading analytics. Qualifications: Proven hands on engineering experience with deep technical expertise in low latency time series databases, using KDB+/q. Experience in Java, C++ will be desired. Deep expertise in KDB+/q or equivalent high performance time series platforms, with demonstrated ownership of production systems. Prior experience building or owning Algorithmic Trading, SOR, Market Making, or Quantitative Trading time series platforms at a global financial institution. Strong understanding of market microstructure, electronic execution workflows, and regional exchange and regulatory regimes. Proven ability to design and operate systems where analytics correctness is non negotiable, even under extreme performance constraints. Strong understanding of performance optimization, and high throughput architectures. Experience defining and governing shared data models used by multiple downstream systems. Ability to prioritize multiple initiatives and deliver in a fast paced, globally distributed environment. Excellent communication skills, with the ability to reason and explain complex systems to engineers, quants, and trading stakeholders. Education: Bachelor's degree / University degree in Computer Science, Engineering, or a related field, or equivalent professional experience. Job Family Group Technology Job Family Applications Development Time Type Full time Most Relevant Skills Please see the requirements listed above. Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi's EEO Policy Statement and the Know Your Rights poster.
McGregor Boyall is seeking a Senior Java Developer for its London Electronic Trading engineering team. You will design low-latency Java applications, work with traders and quantitative teams, and help scale critical trading platforms across asset classes. Hybrid role with three days in the office, you will contribute to high-performance, distributed systems, pricing and market data infrastructure, and continual performance optimisations to improve execution quality.
Aug 14, 2026
Full time
McGregor Boyall is seeking a Senior Java Developer for its London Electronic Trading engineering team. You will design low-latency Java applications, work with traders and quantitative teams, and help scale critical trading platforms across asset classes. Hybrid role with three days in the office, you will contribute to high-performance, distributed systems, pricing and market data infrastructure, and continual performance optimisations to improve execution quality.
For additional information, please review . Senior Low Latency Rust Engineer Engineer the future of global finance. At Citi, our Tech team doesn't just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech. What We do / The Team This is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology Team. The overall objective of this role is to lead applications systems analysis and programming activities.The role is to provide senior, low-latency systems and application framework engineering (skilled in Java, C++ , Rust, KDB, market data, algorithmic trading technology) within the London Based High Performance Architectures (HPA ) team. The team require a specialist on algorithmic trading systems utilities including but not limited to market data replay and back test/simulation utilities. The HPA organization are a high skilled enablement group of Subject Matter experts - who produce application frameworks and engage with application engineers to enable application Modernisation to over 100 teams across Citi with a concentration on low latency eTrading platforms in Markets Technology. Responsibilities include (but not limited to): 90% hands-on in the Rust or Java codebase. We build microservices based event sourcing systems on a low latency in-house framework. Response times in the 10 microsecond to 100 microsecond range. Lead integration of functions to meet goals, deploy new products, and enhance processes Analyse complex business processes, system processes, and industry standards to define and develop solutions to high level problems Provide world class expertise in area of Java low latency development. Utilize advanced knowledge of supported main system flows and comprehensive knowledge of multiple areas to achieve technology goals Consult with end users to identify system function specifications and incorporate into overall system design Influence and negotiate with senior leaders and communicate with external parties Happy to work with and educate and support/mentor Junior developers and less experienced senior Java developers. Key Skills and Experience required Demonstrated Subject Matter Expert (SME) in area(s) of Applications Development In-depth experience with Algorithmic Trading application development, preferably in low latency environment Detailed comprehension and experience with Market Data handling and associated technologies (such as time-series databases e.g. KDB) Demonstrated leadership, project management, and development skills Passion for coding excellent, commercial grade, mission critical Java frameworks based on event sourcing microservices. Complete knowledge of modern Java, the JVM, the Linux Operating system, system calls and Kernel. Knowledge of TCP and other IP based network protocol technologies including hardware accelerated kernel bypass e.g. Solarflare OpenOnload Performance assessment and targeted tuning. Design and architectural elegance. Experience in implementing projects Great communicator with high EQ. Ability to occasionally produce clear diagrammatic documentation and model key aspects in UML sequence diagrams. Relationship and consensus building skills Nice to have Background in C++This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required. What we'll provide you By joining Citi, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as: 27 days annual leave (plus bank holidays) A discretional annual performance related bonus Private Medical Care & Life Insurance Employee Assistance Program Pension Plan Paid Parental Leave Special discounts for employees, family, and friends Access to an array of learning and development resourcesAlongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive. Job Family Group: Technology Job Family: Applications Development Time Type: Full time Most Relevant Skills Please see the requirements listed above. Other Relevant Skills For complementary skills, please see above and/or contact the recruiter. Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review . View Citi's and the poster.
Aug 11, 2026
Full time
For additional information, please review . Senior Low Latency Rust Engineer Engineer the future of global finance. At Citi, our Tech team doesn't just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech. What We do / The Team This is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology Team. The overall objective of this role is to lead applications systems analysis and programming activities.The role is to provide senior, low-latency systems and application framework engineering (skilled in Java, C++ , Rust, KDB, market data, algorithmic trading technology) within the London Based High Performance Architectures (HPA ) team. The team require a specialist on algorithmic trading systems utilities including but not limited to market data replay and back test/simulation utilities. The HPA organization are a high skilled enablement group of Subject Matter experts - who produce application frameworks and engage with application engineers to enable application Modernisation to over 100 teams across Citi with a concentration on low latency eTrading platforms in Markets Technology. Responsibilities include (but not limited to): 90% hands-on in the Rust or Java codebase. We build microservices based event sourcing systems on a low latency in-house framework. Response times in the 10 microsecond to 100 microsecond range. Lead integration of functions to meet goals, deploy new products, and enhance processes Analyse complex business processes, system processes, and industry standards to define and develop solutions to high level problems Provide world class expertise in area of Java low latency development. Utilize advanced knowledge of supported main system flows and comprehensive knowledge of multiple areas to achieve technology goals Consult with end users to identify system function specifications and incorporate into overall system design Influence and negotiate with senior leaders and communicate with external parties Happy to work with and educate and support/mentor Junior developers and less experienced senior Java developers. Key Skills and Experience required Demonstrated Subject Matter Expert (SME) in area(s) of Applications Development In-depth experience with Algorithmic Trading application development, preferably in low latency environment Detailed comprehension and experience with Market Data handling and associated technologies (such as time-series databases e.g. KDB) Demonstrated leadership, project management, and development skills Passion for coding excellent, commercial grade, mission critical Java frameworks based on event sourcing microservices. Complete knowledge of modern Java, the JVM, the Linux Operating system, system calls and Kernel. Knowledge of TCP and other IP based network protocol technologies including hardware accelerated kernel bypass e.g. Solarflare OpenOnload Performance assessment and targeted tuning. Design and architectural elegance. Experience in implementing projects Great communicator with high EQ. Ability to occasionally produce clear diagrammatic documentation and model key aspects in UML sequence diagrams. Relationship and consensus building skills Nice to have Background in C++This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required. What we'll provide you By joining Citi, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as: 27 days annual leave (plus bank holidays) A discretional annual performance related bonus Private Medical Care & Life Insurance Employee Assistance Program Pension Plan Paid Parental Leave Special discounts for employees, family, and friends Access to an array of learning and development resourcesAlongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive. Job Family Group: Technology Job Family: Applications Development Time Type: Full time Most Relevant Skills Please see the requirements listed above. Other Relevant Skills For complementary skills, please see above and/or contact the recruiter. Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review . View Citi's and the poster.
Senior Low Latency EngineerApplyremote type: Hybridlocations: London United Kingdomtime type: Full timeposted on: Posted Todayjob requisition id: Senior Low Latency Engineer Engineer the future of global finance. At Citi, our Tech team doesn't just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech. What We do / The Team This is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology Team. The overall objective of this role is to lead applications systems analysis and programming activities.The role is to provide senior, low-latency systems and application framework engineering (skilled in Java, C++ , Rust, KDB, market data, algorithmic trading technology) within the London Based High Performance Architectures (HPA ) team. The team require a specialist on algorithmic trading systems utilities including but not limited to market data replay and back test/simulation utilities. The HPA organization are a high skilled enablement group of Subject Matter experts - who produce application frameworks and engage with application engineers to enable application Modernisation to over 100 teams across Citi with a concentration on low latency eTrading platforms in Markets Technology. Responsibilities include (but not limited to): 90% hands in the Java or Rust codebase. We build microservices based event sourcing systems on a low latency in-house framework. Response times in the 10 microsecond to 100 microsecond range. Lead integration of functions to meet goals, deploy new products, and enhance processes Analyse complex business processes, system processes, and industry standards to define and develop solutions to high level problems Provide world class expertise in area of Java low latency development. Utilize advanced knowledge of supported main system flows and comprehensive knowledge of multiple areas to achieve technology goals Consult with end users to identify system function specifications and incorporate into overall system design Influence and negotiate with senior leaders and communicate with external parties Happy to work with and educate and support/mentor Junior developers and less experienced senior Java developers. Key Skills and Experience required Demonstrated Subject Matter Expert (SME) in area(s) of Applications Development In-depth experience with Algorithmic Trading application development, preferably in low latency environment Detailed comprehension and experience with Market Data handling and associated technologies (such as time-series databases e.g. KDB) Demonstrated leadership, project management, and development skills Passion for coding excellent, commercial grade, mission critical Java frameworks based on event sourcing microservices. Complete knowledge of modern Java, the JVM, the Linux Operating system, system calls and Kernel. Knowledge of TCP and other IP based network protocol technologies including hardware accelerated kernel bypass e.g. Solarflare OpenOnload Performance assessment and targeted tuning. Design and architectural elegance. Experience in implementing projects Great communicator with high EQ. Ability to occasionally produce clear diagrammatic documentation and model key aspects in UML sequence diagrams. Relationship and consensus building skills Nice to have Background in C++This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required. What we'll provide you By joining Citi, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as: 27 days annual leave (plus bank holidays) A discretional annual performance related bonus Private Medical Care & Life Insurance Employee Assistance Program Pension Plan Paid Parental Leave Special discounts for employees, family, and friends Access to an array of learning and development resourcesVisit our About Us Culture, Values & Benefits page to learn more.Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.
Aug 03, 2026
Full time
Senior Low Latency EngineerApplyremote type: Hybridlocations: London United Kingdomtime type: Full timeposted on: Posted Todayjob requisition id: Senior Low Latency Engineer Engineer the future of global finance. At Citi, our Tech team doesn't just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech. What We do / The Team This is a senior level position responsible for establishing and implementing new or revised application systems and programs in coordination with the Technology Team. The overall objective of this role is to lead applications systems analysis and programming activities.The role is to provide senior, low-latency systems and application framework engineering (skilled in Java, C++ , Rust, KDB, market data, algorithmic trading technology) within the London Based High Performance Architectures (HPA ) team. The team require a specialist on algorithmic trading systems utilities including but not limited to market data replay and back test/simulation utilities. The HPA organization are a high skilled enablement group of Subject Matter experts - who produce application frameworks and engage with application engineers to enable application Modernisation to over 100 teams across Citi with a concentration on low latency eTrading platforms in Markets Technology. Responsibilities include (but not limited to): 90% hands in the Java or Rust codebase. We build microservices based event sourcing systems on a low latency in-house framework. Response times in the 10 microsecond to 100 microsecond range. Lead integration of functions to meet goals, deploy new products, and enhance processes Analyse complex business processes, system processes, and industry standards to define and develop solutions to high level problems Provide world class expertise in area of Java low latency development. Utilize advanced knowledge of supported main system flows and comprehensive knowledge of multiple areas to achieve technology goals Consult with end users to identify system function specifications and incorporate into overall system design Influence and negotiate with senior leaders and communicate with external parties Happy to work with and educate and support/mentor Junior developers and less experienced senior Java developers. Key Skills and Experience required Demonstrated Subject Matter Expert (SME) in area(s) of Applications Development In-depth experience with Algorithmic Trading application development, preferably in low latency environment Detailed comprehension and experience with Market Data handling and associated technologies (such as time-series databases e.g. KDB) Demonstrated leadership, project management, and development skills Passion for coding excellent, commercial grade, mission critical Java frameworks based on event sourcing microservices. Complete knowledge of modern Java, the JVM, the Linux Operating system, system calls and Kernel. Knowledge of TCP and other IP based network protocol technologies including hardware accelerated kernel bypass e.g. Solarflare OpenOnload Performance assessment and targeted tuning. Design and architectural elegance. Experience in implementing projects Great communicator with high EQ. Ability to occasionally produce clear diagrammatic documentation and model key aspects in UML sequence diagrams. Relationship and consensus building skills Nice to have Background in C++This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required. What we'll provide you By joining Citi, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as: 27 days annual leave (plus bank holidays) A discretional annual performance related bonus Private Medical Care & Life Insurance Employee Assistance Program Pension Plan Paid Parental Leave Special discounts for employees, family, and friends Access to an array of learning and development resourcesVisit our About Us Culture, Values & Benefits page to learn more.Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.
Senior Java Developer Annual Salary: Competitive with performance-related bonus Location: City of London (Hybrid - 3 days a week onsite) Job Type: Full-Time, Permanent A new exciting opportunity has become available for an experienced Senior Java Developer to join a growing Technology department working specifically within Capital Markets for an SME, post-trade solutions organisation. This role offers an exciting opportunity to play a central role in building and evolving their post-trade technology platform. You will be instrumental in developing in-house systems, APIs, client reporting, and web portals, as well as customising third-party trading systems. This position is a key step towards a Head of Engineering role, anticipated within 24 months based on performance and organisational growth. Day-to-day of the role: Design, develop, and maintain in-house systems, APIs, reporting tools, and the client web portal. Implement AI in the Software Development Life Cycle (SDLC) process. Customise and extend third-party trading systems to meet business requirements. Write clean, well-tested code following SOLID principles, Design Patterns, and Clean Code practices. Apply Test-Driven Development (TDD) and Behaviour-Driven Development (BDD) methodologies; maintain test coverage using JUnit, Spock, and Mockito. Participate in code reviews and contribute to the continual improvement of engineering standards. Collaborate with Client Services and Product Management to understand requirements and propose solutions. Manage and mentor a small team of Java developers, promoting a culture of quality, ownership, and continuous improvement. Required Skills & Qualifications: 7+ years' Java development experience in Financial Services. Strong understanding of capital markets, particularly Clearing or Prime Brokerage services. Proficiency in Java 11+, Spring/Spring Boot, multi-threading, profiling, performance tuning, and Remote Method Invocation (RMI). Experience with CI build and deployment management tools, microservices, and modern software practices like Agile and automated builds/deployments. Proficiency with Git, Maven, and test frameworks like JUnit/Spock. Experience in cloud platforms (AWS, Azure, or GCP), microservices, and event-driven architectures. Desirable: Experience leading a development team and working with offshore teams. Benefits: Clear growth pathway toward Head of Engineering role. Flexible and hybrid working arrangements. Private healthcare, pension, life assurance, and critical illness insurance. A leadership team that values engineering as a core business differentiator. To apply for this Senior Java Developer position, please submit your CV to be immediately considered.
May 24, 2026
Full time
Senior Java Developer Annual Salary: Competitive with performance-related bonus Location: City of London (Hybrid - 3 days a week onsite) Job Type: Full-Time, Permanent A new exciting opportunity has become available for an experienced Senior Java Developer to join a growing Technology department working specifically within Capital Markets for an SME, post-trade solutions organisation. This role offers an exciting opportunity to play a central role in building and evolving their post-trade technology platform. You will be instrumental in developing in-house systems, APIs, client reporting, and web portals, as well as customising third-party trading systems. This position is a key step towards a Head of Engineering role, anticipated within 24 months based on performance and organisational growth. Day-to-day of the role: Design, develop, and maintain in-house systems, APIs, reporting tools, and the client web portal. Implement AI in the Software Development Life Cycle (SDLC) process. Customise and extend third-party trading systems to meet business requirements. Write clean, well-tested code following SOLID principles, Design Patterns, and Clean Code practices. Apply Test-Driven Development (TDD) and Behaviour-Driven Development (BDD) methodologies; maintain test coverage using JUnit, Spock, and Mockito. Participate in code reviews and contribute to the continual improvement of engineering standards. Collaborate with Client Services and Product Management to understand requirements and propose solutions. Manage and mentor a small team of Java developers, promoting a culture of quality, ownership, and continuous improvement. Required Skills & Qualifications: 7+ years' Java development experience in Financial Services. Strong understanding of capital markets, particularly Clearing or Prime Brokerage services. Proficiency in Java 11+, Spring/Spring Boot, multi-threading, profiling, performance tuning, and Remote Method Invocation (RMI). Experience with CI build and deployment management tools, microservices, and modern software practices like Agile and automated builds/deployments. Proficiency with Git, Maven, and test frameworks like JUnit/Spock. Experience in cloud platforms (AWS, Azure, or GCP), microservices, and event-driven architectures. Desirable: Experience leading a development team and working with offshore teams. Benefits: Clear growth pathway toward Head of Engineering role. Flexible and hybrid working arrangements. Private healthcare, pension, life assurance, and critical illness insurance. A leadership team that values engineering as a core business differentiator. To apply for this Senior Java Developer position, please submit your CV to be immediately considered.
About the role: As a Senior Smart Contract Developer / Blockchain Engineer with expertise in enterprise blockchain platforms, you will collaborate with our client's blockchain and cloud infrastructure teams, architects, product owners, and external partners in multi-organisation blockchain networks. You will be responsible for designing, developing, testing, and deploying smart contracts and blockchain solutions for enterprise environments. J ob Details: Location: London Duration: 04/12/2026 Days on site: 2 Roles and Responsibilities: Design, develop, test, and deploy smart contracts for enterprise blockchain platforms (Ethereum, GoQuorum, Hyperledger Besu, Corda). Implement asset tokenization, on-chain/off-chain data models, and blockchain transaction workflows. Develop and integrate RESTful APIs and microservices (Node.js / Java) to interact with smart contracts. Ensure security, performance, and scalability of smart contracts and blockchain applications. Collaborate with architects, product owners, and external partners in multi-organization blockchain networks. Lead or mentor development teams, enforcing coding standards, testing, and best practices. Work closely with cloud infrastructure teams to deploy blockchain solutions using Azure/AWS services. Support POCs, innovation initiatives, and exploration of Layer 2 scaling solutions. Participate in design reviews, audits, and governance processes related to blockchain systems. Other stuff we're potentially looking for: 8+ years of experience in software engineering with strong blockchain focus. Hands-on experience with Solidity smart contract development. Strong understanding of Ethereum-compatible platforms (GoQuorum, Hyperledger Besu). Experience with enterprise blockchain frameworks such as R3 Corda and Ripple. Proficiency in Node.js, TypeScript, and/or Java (Spring Boot). Strong knowledge of microservices architecture and asynchronous processing patterns. Experience designing on-chain vs off-chain data models. Familiarity with REST APIs, event-driven systems, and message queues. Solid understanding of blockchain security concepts (permissions, key management, transaction integrity). What's in it for you? Our client loves to reward their people for doing a great job. This is a contract role until 2/2026. A daily rate, in-scope IR35, of £535 (via a Hays Approved Umbrella Company). This role provides a hybrid working access in London (2 days onsite). Next Steps: Once you've applied, one of our friendly recruitment consultants will give you a call and talk you through the screening process.If your application is successful, you'll be involved in a live virtual interview with one of our client's hiring managers to get to know you better. We look forward to speaking to you! Hays Talent Solutions is a trading division of Hays Specialist Recruitment Limited and acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk
May 20, 2026
Contractor
About the role: As a Senior Smart Contract Developer / Blockchain Engineer with expertise in enterprise blockchain platforms, you will collaborate with our client's blockchain and cloud infrastructure teams, architects, product owners, and external partners in multi-organisation blockchain networks. You will be responsible for designing, developing, testing, and deploying smart contracts and blockchain solutions for enterprise environments. J ob Details: Location: London Duration: 04/12/2026 Days on site: 2 Roles and Responsibilities: Design, develop, test, and deploy smart contracts for enterprise blockchain platforms (Ethereum, GoQuorum, Hyperledger Besu, Corda). Implement asset tokenization, on-chain/off-chain data models, and blockchain transaction workflows. Develop and integrate RESTful APIs and microservices (Node.js / Java) to interact with smart contracts. Ensure security, performance, and scalability of smart contracts and blockchain applications. Collaborate with architects, product owners, and external partners in multi-organization blockchain networks. Lead or mentor development teams, enforcing coding standards, testing, and best practices. Work closely with cloud infrastructure teams to deploy blockchain solutions using Azure/AWS services. Support POCs, innovation initiatives, and exploration of Layer 2 scaling solutions. Participate in design reviews, audits, and governance processes related to blockchain systems. Other stuff we're potentially looking for: 8+ years of experience in software engineering with strong blockchain focus. Hands-on experience with Solidity smart contract development. Strong understanding of Ethereum-compatible platforms (GoQuorum, Hyperledger Besu). Experience with enterprise blockchain frameworks such as R3 Corda and Ripple. Proficiency in Node.js, TypeScript, and/or Java (Spring Boot). Strong knowledge of microservices architecture and asynchronous processing patterns. Experience designing on-chain vs off-chain data models. Familiarity with REST APIs, event-driven systems, and message queues. Solid understanding of blockchain security concepts (permissions, key management, transaction integrity). What's in it for you? Our client loves to reward their people for doing a great job. This is a contract role until 2/2026. A daily rate, in-scope IR35, of £535 (via a Hays Approved Umbrella Company). This role provides a hybrid working access in London (2 days onsite). Next Steps: Once you've applied, one of our friendly recruitment consultants will give you a call and talk you through the screening process.If your application is successful, you'll be involved in a live virtual interview with one of our client's hiring managers to get to know you better. We look forward to speaking to you! Hays Talent Solutions is a trading division of Hays Specialist Recruitment Limited and acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk
Full-Stack C# Developer - Greenfield Projects - £40k - £110k DOE (Various roles) City of London Are you a talented developer looking to work in a non-corporate, collaborative environment where your technical input makes a genuine difference? We are currently partnering with a forward-thinking team in the City of London that is transforming the world of sports market analysis. They are seeking passionate Mid-level and Senior Full-Stack Developers to join their growing team.This is a unique opportunity to work on greenfield projects within a high-performance, evidence-driven environment. You will be part of a small, agile team, free from bureaucratic hurdles, where your ideas and solutions are truly valued. Key Responsibilities Build and maintain bespoke in-house applications within a C#/.NET, SQL Server, and ASP.NET ecosystem. Analyse sports markets and identify new investment opportunities using highly automated, data-driven processes. Take ownership of greenfield projects, allowing you to influence the development process and leave your mark from day one. Key Skills and Requirements A degree in Computer Science or a related scientific subject. Significant, recent experience with C# and the latest .NET platform versions. Solid database development expertise, specifically using SQL Server, Oracle, or equivalent systems. Desirable skills: We would love to hear from you if you also have experience in multi-threaded application development, JavaScript front-end frameworks like React, network programming (TCP/UDP), or distributed version control systems like Git or PlasticSCM. Salary: £40,000 to £110,000, Benefits: Gym membership, pension scheme, private health insurance, and a collaborative team that values a healthy work-life balance.If you've held any of these roles or used these technologies/skills, this role could be a great fit: Full-Stack Developer, C# Software Engineer, .NET Developer, ASP.NET Developer, Greenfield Development, Automated Systems Engineer, Sports Trading Tech Deerfoot Recruitment Solutions Ltd is a leading independent tech recruitment consultancy in the UK. For every CV sent to clients, we donate £1 to The Born Free Foundation. We are a Climate Action Workforce in partnership with Ecologi. If this role isn't right for you, explore our referral reward program with payouts at interview and placement milestones. Visit our website for details. Deerfoot Recruitment Solutions Ltd is acting as an Employment Agency in relation to this vacancy.
May 19, 2026
Full time
Full-Stack C# Developer - Greenfield Projects - £40k - £110k DOE (Various roles) City of London Are you a talented developer looking to work in a non-corporate, collaborative environment where your technical input makes a genuine difference? We are currently partnering with a forward-thinking team in the City of London that is transforming the world of sports market analysis. They are seeking passionate Mid-level and Senior Full-Stack Developers to join their growing team.This is a unique opportunity to work on greenfield projects within a high-performance, evidence-driven environment. You will be part of a small, agile team, free from bureaucratic hurdles, where your ideas and solutions are truly valued. Key Responsibilities Build and maintain bespoke in-house applications within a C#/.NET, SQL Server, and ASP.NET ecosystem. Analyse sports markets and identify new investment opportunities using highly automated, data-driven processes. Take ownership of greenfield projects, allowing you to influence the development process and leave your mark from day one. Key Skills and Requirements A degree in Computer Science or a related scientific subject. Significant, recent experience with C# and the latest .NET platform versions. Solid database development expertise, specifically using SQL Server, Oracle, or equivalent systems. Desirable skills: We would love to hear from you if you also have experience in multi-threaded application development, JavaScript front-end frameworks like React, network programming (TCP/UDP), or distributed version control systems like Git or PlasticSCM. Salary: £40,000 to £110,000, Benefits: Gym membership, pension scheme, private health insurance, and a collaborative team that values a healthy work-life balance.If you've held any of these roles or used these technologies/skills, this role could be a great fit: Full-Stack Developer, C# Software Engineer, .NET Developer, ASP.NET Developer, Greenfield Development, Automated Systems Engineer, Sports Trading Tech Deerfoot Recruitment Solutions Ltd is a leading independent tech recruitment consultancy in the UK. For every CV sent to clients, we donate £1 to The Born Free Foundation. We are a Climate Action Workforce in partnership with Ecologi. If this role isn't right for you, explore our referral reward program with payouts at interview and placement milestones. Visit our website for details. Deerfoot Recruitment Solutions Ltd is acting as an Employment Agency in relation to this vacancy.
Deerfoot Recruitment Solutions Limited
City, London
Full-Stack C# Developer - Greenfield Projects - 40k - 110k DOE (Various roles) City of London Are you a talented developer looking to work in a non-corporate, collaborative environment where your technical input makes a genuine difference? We are currently partnering with a forward-thinking team in the City of London that is transforming the world of sports market analysis. They are seeking passionate Mid-level and Senior Full-Stack Developers to join their growing team. This is a unique opportunity to work on greenfield projects within a high-performance, evidence-driven environment. You will be part of a small, agile team, free from bureaucratic hurdles, where your ideas and solutions are truly valued. Key Responsibilities Build and maintain bespoke in-house applications within a C#/.NET, SQL Server, and ASP.NET ecosystem. Analyse sports markets and identify new investment opportunities using highly automated, data-driven processes. Take ownership of greenfield projects, allowing you to influence the development process and leave your mark from day one. Key Skills and Requirements A degree in Computer Science or a related scientific subject. Significant, recent experience with C# and the latest .NET platform versions. Solid database development expertise, specifically using SQL Server, Oracle, or equivalent systems. Desirable skills: We would love to hear from you if you also have experience in multi-threaded application development, JavaScript front-end frameworks like React, network programming (TCP/UDP), or distributed version control systems like Git or PlasticSCM. Salary: 40,000 to 110,000, Benefits: Gym membership, pension scheme, private health insurance, and a collaborative team that values a healthy work-life balance. If you've held any of these roles or used these technologies/skills, this role could be a great fit: Full-Stack Developer, C# Software Engineer, .NET Developer, ASP.NET Developer, Greenfield Development, Automated Systems Engineer, Sports Trading Tech Deerfoot Recruitment Solutions Ltd is a leading independent tech recruitment consultancy in the UK. For every CV sent to clients, we donate 1 to The Born Free Foundation. We are a Climate Action Workforce in partnership with Ecologi. If this role isn't right for you, explore our referral reward program with payouts at interview and placement milestones. Visit our website for details. Deerfoot Recruitment Solutions Ltd is acting as an Employment Agency in relation to this vacancy.
Apr 30, 2026
Full time
Full-Stack C# Developer - Greenfield Projects - 40k - 110k DOE (Various roles) City of London Are you a talented developer looking to work in a non-corporate, collaborative environment where your technical input makes a genuine difference? We are currently partnering with a forward-thinking team in the City of London that is transforming the world of sports market analysis. They are seeking passionate Mid-level and Senior Full-Stack Developers to join their growing team. This is a unique opportunity to work on greenfield projects within a high-performance, evidence-driven environment. You will be part of a small, agile team, free from bureaucratic hurdles, where your ideas and solutions are truly valued. Key Responsibilities Build and maintain bespoke in-house applications within a C#/.NET, SQL Server, and ASP.NET ecosystem. Analyse sports markets and identify new investment opportunities using highly automated, data-driven processes. Take ownership of greenfield projects, allowing you to influence the development process and leave your mark from day one. Key Skills and Requirements A degree in Computer Science or a related scientific subject. Significant, recent experience with C# and the latest .NET platform versions. Solid database development expertise, specifically using SQL Server, Oracle, or equivalent systems. Desirable skills: We would love to hear from you if you also have experience in multi-threaded application development, JavaScript front-end frameworks like React, network programming (TCP/UDP), or distributed version control systems like Git or PlasticSCM. Salary: 40,000 to 110,000, Benefits: Gym membership, pension scheme, private health insurance, and a collaborative team that values a healthy work-life balance. If you've held any of these roles or used these technologies/skills, this role could be a great fit: Full-Stack Developer, C# Software Engineer, .NET Developer, ASP.NET Developer, Greenfield Development, Automated Systems Engineer, Sports Trading Tech Deerfoot Recruitment Solutions Ltd is a leading independent tech recruitment consultancy in the UK. For every CV sent to clients, we donate 1 to The Born Free Foundation. We are a Climate Action Workforce in partnership with Ecologi. If this role isn't right for you, explore our referral reward program with payouts at interview and placement milestones. Visit our website for details. Deerfoot Recruitment Solutions Ltd is acting as an Employment Agency in relation to this vacancy.
