Pontoon
Full-Stack Engineer (FX Trading Applications) Location: London (onsite 3 days per week) Day Rate: £700 (via Umbrella Company) Contract: Fixed Term Contract until 31 December 2026 About the Role Are you ready to dive into the dynamic world of FX Trading technology? Our client is seeking a talented Full-Stack Engineer with strong Java expertise and a passion for solving complex technical challenges. You'll play a key role in building mission-critical components that power high-performance trading systems-working closely with cross-functional teams in a fast-paced, agile environment. Key Responsibilities Engineering & Development Design and develop backend and frontend features for FX Trading applications. Write well-designed, testable, and efficient code across the full stack. Build automated test suites (unit, integration, contract, UI/API, performance). Define metrics and implement automated evaluation and drift detection for AI-related components. Reduce technical debt while improving modularity, observability, reliability, and performance. Architecture & Integration Integrate software components into cohesive, production-ready systems. Design clear, maintainable API contracts and ensure backward-compatible changes. Optimise low-latency, high-throughput services. Operational Excellence Troubleshoot, debug, and enhance existing systems. Instrument services with metrics, logs, and traces for faster incident resolution. Participate in deployments in line with strict change-control processes. Champion production-ready development through CI/CD gates, feature flags, and safe rollout/rollback strategies. Collaboration & Continuous Improvement Partner with Product, Sales, Trading, Operations, and Data Science teams to deliver business-aligned features. Participate in peer reviews while promoting secure coding and performance best practices. Recommend improvements in architecture, tooling, developer experience, and testing strategy. Contribute to a culture of engineering excellence and innovation. About You You're an engineer who thrives in agile, collaborative environments and enjoys building systems that genuinely influence business outcomes. You bring strong Java expertise, familiarity with Spring/Spring Boot , and a solid understanding of RESTful APIs and microservices . Experience with Kafka , SQL , and frontend technologies like Angular or React will help you shine. And if you have exposure to AI or Machine Learning , even better-that's a bonus our client truly values. Qualifications Bachelor's degree in Computer Science, Engineering, or related field (or equivalent experience). 5-9 years of hands-on professional software development experience. Experience in financial services-particularly within FX Trading -is highly desirable. Strong communication skills and proven success working in agile, cross-functional teams. Join the Team Join a vibrant, forward-thinking engineering group dedicated to pushing the boundaries of technology in financial services. If you're excited to build mission-critical systems that elevate trading performance and user experience, we want to hear from you. Apply now and take the next step in your engineering career! Pontoon is an employment consultancy. We put expertise, energy, and enthusiasm into improving everyone's chance of being part of the workplace. We respect and appreciate people of all ethnicities, generations, religious beliefs, sexual orientations, gender identities and more. We do this by showcasing their talents, skills, and unique experience in an inclusive environment that helps them thrive. We use generative AI tools to support our candidate screening process. This helps us ensure a fair, consistent, and efficient experience for all applicants. Rest assured, all final decisions are made by our hiring team, and your application will be reviewed with care and attention. Due to the high volume of applications we receive, we are unable to respond to everyone individually. If you do not hear from us within 48 hours of applying, please assume that your application has been unsuccessful on this occasion.
Full-Stack Engineer (FX Trading Applications) Location: London (onsite 3 days per week) Day Rate: £700 (via Umbrella Company) Contract: Fixed Term Contract until 31 December 2026 About the Role Are you ready to dive into the dynamic world of FX Trading technology? Our client is seeking a talented Full-Stack Engineer with strong Java expertise and a passion for solving complex technical challenges. You'll play a key role in building mission-critical components that power high-performance trading systems-working closely with cross-functional teams in a fast-paced, agile environment. Key Responsibilities Engineering & Development Design and develop backend and frontend features for FX Trading applications. Write well-designed, testable, and efficient code across the full stack. Build automated test suites (unit, integration, contract, UI/API, performance). Define metrics and implement automated evaluation and drift detection for AI-related components. Reduce technical debt while improving modularity, observability, reliability, and performance. Architecture & Integration Integrate software components into cohesive, production-ready systems. Design clear, maintainable API contracts and ensure backward-compatible changes. Optimise low-latency, high-throughput services. Operational Excellence Troubleshoot, debug, and enhance existing systems. Instrument services with metrics, logs, and traces for faster incident resolution. Participate in deployments in line with strict change-control processes. Champion production-ready development through CI/CD gates, feature flags, and safe rollout/rollback strategies. Collaboration & Continuous Improvement Partner with Product, Sales, Trading, Operations, and Data Science teams to deliver business-aligned features. Participate in peer reviews while promoting secure coding and performance best practices. Recommend improvements in architecture, tooling, developer experience, and testing strategy. Contribute to a culture of engineering excellence and innovation. About You You're an engineer who thrives in agile, collaborative environments and enjoys building systems that genuinely influence business outcomes. You bring strong Java expertise, familiarity with Spring/Spring Boot , and a solid understanding of RESTful APIs and microservices . Experience with Kafka , SQL , and frontend technologies like Angular or React will help you shine. And if you have exposure to AI or Machine Learning , even better-that's a bonus our client truly values. Qualifications Bachelor's degree in Computer Science, Engineering, or related field (or equivalent experience). 5-9 years of hands-on professional software development experience. Experience in financial services-particularly within FX Trading -is highly desirable. Strong communication skills and proven success working in agile, cross-functional teams. Join the Team Join a vibrant, forward-thinking engineering group dedicated to pushing the boundaries of technology in financial services. If you're excited to build mission-critical systems that elevate trading performance and user experience, we want to hear from you. Apply now and take the next step in your engineering career! Pontoon is an employment consultancy. We put expertise, energy, and enthusiasm into improving everyone's chance of being part of the workplace. We respect and appreciate people of all ethnicities, generations, religious beliefs, sexual orientations, gender identities and more. We do this by showcasing their talents, skills, and unique experience in an inclusive environment that helps them thrive. We use generative AI tools to support our candidate screening process. This helps us ensure a fair, consistent, and efficient experience for all applicants. Rest assured, all final decisions are made by our hiring team, and your application will be reviewed with care and attention. Due to the high volume of applications we receive, we are unable to respond to everyone individually. If you do not hear from us within 48 hours of applying, please assume that your application has been unsuccessful on this occasion.
SR2
Founding Full-Stack Engineer (Greenfield Digital Banking) Central London 4 days onsite Full-time 90,000 - 100,000 + 15-20% bonus We're working with a highly successful, family-owned international private bank to hire a Founding Full-Stack Engineer for a brand new, greenfield digital banking build based in Central London. This is a rare opportunity to join right at the beginning of a newly formed product team and help build a next-generation digital banking experience from first principles deliberately outside of legacy systems. The environment is genuinely "startup-style" (small team, high ownership, fast delivery), but backed by serious scale, long-term investment, and a strong focus on quality, stability and client trust. The role As one of the first engineering hires, you'll play a key part in shaping: the technical foundations engineering standards architecture and system design how the team builds and ships product You'll work closely with Product and Design, delivering secure, high-quality digital experiences for high-value clients and complex workflows. What you'll do Design, build and maintain end-to-end features across frontend and backend Architect scalable, secure and maintainable systems for private banking / institutional use cases Own key technical decisions, balancing delivery speed with long-term quality Build APIs, services, data models and modern web experiences Establish high standards of engineering quality through testing, reviews and automation Contribute to platform foundations, shared components and internal tooling Embed security, performance and resilience best practices into everything you ship Help define engineering standards and ways of working as the team grows What we're looking for 8-12+ years' experience as a full-stack or senior engineer owning production systems Strong experience building modern web applications across frontend and backend Frontend expertise with modern frameworks (React, TypeScript or similar) Strong backend experience (Node.js, Java, Python or similar) Solid understanding of APIs, architecture, databases and cloud infrastructure Exposure to CI/CD and modern DevOps practices (containers, Kubernetes, automation) Comfortable being a technical owner in open-ended / ambiguous environments A builder mindset - pragmatic, delivery-focused, and quality-led Experience in financial services / fintech / regulated environments is beneficial but not essential Strong awareness of security, privacy and compliance considerations is highly valued Why this opportunity stands out Genuine greenfield build with meaningful ownership from day one Founding hire in a small, high-calibre team Startup-style delivery with the backing of a global financial institution Direct access to decision-makers and influence over product direction Quality-first culture focused on trust, stability and long-term value Competitive salary + strong bonus + benefits
Founding Full-Stack Engineer (Greenfield Digital Banking) Central London 4 days onsite Full-time 90,000 - 100,000 + 15-20% bonus We're working with a highly successful, family-owned international private bank to hire a Founding Full-Stack Engineer for a brand new, greenfield digital banking build based in Central London. This is a rare opportunity to join right at the beginning of a newly formed product team and help build a next-generation digital banking experience from first principles deliberately outside of legacy systems. The environment is genuinely "startup-style" (small team, high ownership, fast delivery), but backed by serious scale, long-term investment, and a strong focus on quality, stability and client trust. The role As one of the first engineering hires, you'll play a key part in shaping: the technical foundations engineering standards architecture and system design how the team builds and ships product You'll work closely with Product and Design, delivering secure, high-quality digital experiences for high-value clients and complex workflows. What you'll do Design, build and maintain end-to-end features across frontend and backend Architect scalable, secure and maintainable systems for private banking / institutional use cases Own key technical decisions, balancing delivery speed with long-term quality Build APIs, services, data models and modern web experiences Establish high standards of engineering quality through testing, reviews and automation Contribute to platform foundations, shared components and internal tooling Embed security, performance and resilience best practices into everything you ship Help define engineering standards and ways of working as the team grows What we're looking for 8-12+ years' experience as a full-stack or senior engineer owning production systems Strong experience building modern web applications across frontend and backend Frontend expertise with modern frameworks (React, TypeScript or similar) Strong backend experience (Node.js, Java, Python or similar) Solid understanding of APIs, architecture, databases and cloud infrastructure Exposure to CI/CD and modern DevOps practices (containers, Kubernetes, automation) Comfortable being a technical owner in open-ended / ambiguous environments A builder mindset - pragmatic, delivery-focused, and quality-led Experience in financial services / fintech / regulated environments is beneficial but not essential Strong awareness of security, privacy and compliance considerations is highly valued Why this opportunity stands out Genuine greenfield build with meaningful ownership from day one Founding hire in a small, high-calibre team Startup-style delivery with the backing of a global financial institution Direct access to decision-makers and influence over product direction Quality-first culture focused on trust, stability and long-term value Competitive salary + strong bonus + benefits
