At Complii, we are on the lookout for a Senior Developer to play a key role in strengthening and scaling a business-critical technology platform. This role is focused on reducing risk, supporting significant scale, and helping secure the technical foundations needed to deliver our long-term vision of connected customer technology. If you enjoy working on complex systems, bringing clarity to areas of technical uncertainty, and having real influence over architectural decisions early on, this is a role where your impact will be felt quickly and meaningfully. You will play a critical role in providing technical cover across the orchestration layer of our platform, which is currently the area of highest risk and opportunity. From day one, the priority is reducing risk, supporting delivery at scale, and helping the wider team gain confidence in the codebase and future direction of the platform. What you receive for joining us We believe in rewarding expertise and accountability, which is why we offer an excellent salary. This includes 25 days holiday plus bank holidays, an additional day off for your birthday, a collaborative and supportive working environment, and the opportunity to work closely with senior leaders who value clarity, technical judgement, and delivery. Here is a look at some of the things you will be doing Supporting and contributing to the Ruby on Rails orchestration layer, helping to reduce technical risk and ensure the platform is robust, scalable, and well understood Supporting the team through a period of significant scale, providing hands-on technical expertise to stabilise, improve, and evolve the existing codebase Working closely with stakeholders to help secure the technical foundations needed for Complii s future vision of connected customer technology Contributing to architectural decisions, code quality, and best practices, while accelerating delivery and confidence across the engineering function Can you show experience in some of these areas Strong experience using the Ruby on Rails framework, with supporting knowledge of technologies such as Postgres, Redis, Sidekiq/ActiveJob, and HTML/jQuery Experience designing and working with APIs, including third-party integrations, and deploying applications using Heroku or similar PaaS providers A pragmatic approach to problem-solving, with a focus on simplicity, risk reduction, and building solid technical foundations A collaborative mindset, strong communication skills, and the ability to make a tangible impact within the first 90 days If you feel you have the skills and drive to make an impact, even if you don t meet every requirement above, we d still love to hear from you. Complii is a leading integrated provider of safety and regulatory compliance services across our water, air, fire, and electrical divisions, supporting organisations nationwide to operate safely, compliantly, and responsibly. This is a fully remote role and can be based anywhere in the UK, offering the opportunity to shape a critical platform and make a lasting difference.
Feb 01, 2026
Full time
At Complii, we are on the lookout for a Senior Developer to play a key role in strengthening and scaling a business-critical technology platform. This role is focused on reducing risk, supporting significant scale, and helping secure the technical foundations needed to deliver our long-term vision of connected customer technology. If you enjoy working on complex systems, bringing clarity to areas of technical uncertainty, and having real influence over architectural decisions early on, this is a role where your impact will be felt quickly and meaningfully. You will play a critical role in providing technical cover across the orchestration layer of our platform, which is currently the area of highest risk and opportunity. From day one, the priority is reducing risk, supporting delivery at scale, and helping the wider team gain confidence in the codebase and future direction of the platform. What you receive for joining us We believe in rewarding expertise and accountability, which is why we offer an excellent salary. This includes 25 days holiday plus bank holidays, an additional day off for your birthday, a collaborative and supportive working environment, and the opportunity to work closely with senior leaders who value clarity, technical judgement, and delivery. Here is a look at some of the things you will be doing Supporting and contributing to the Ruby on Rails orchestration layer, helping to reduce technical risk and ensure the platform is robust, scalable, and well understood Supporting the team through a period of significant scale, providing hands-on technical expertise to stabilise, improve, and evolve the existing codebase Working closely with stakeholders to help secure the technical foundations needed for Complii s future vision of connected customer technology Contributing to architectural decisions, code quality, and best practices, while accelerating delivery and confidence across the engineering function Can you show experience in some of these areas Strong experience using the Ruby on Rails framework, with supporting knowledge of technologies such as Postgres, Redis, Sidekiq/ActiveJob, and HTML/jQuery Experience designing and working with APIs, including third-party integrations, and deploying applications using Heroku or similar PaaS providers A pragmatic approach to problem-solving, with a focus on simplicity, risk reduction, and building solid technical foundations A collaborative mindset, strong communication skills, and the ability to make a tangible impact within the first 90 days If you feel you have the skills and drive to make an impact, even if you don t meet every requirement above, we d still love to hear from you. Complii is a leading integrated provider of safety and regulatory compliance services across our water, air, fire, and electrical divisions, supporting organisations nationwide to operate safely, compliantly, and responsibly. This is a fully remote role and can be based anywhere in the UK, offering the opportunity to shape a critical platform and make a lasting difference.
At Complii, we are on the lookout for a Senior Developer to play a key role in strengthening and scaling a business-critical technology platform. This role is focused on reducing risk, supporting significant scale, and helping secure the technical foundations needed to deliver our long-term vision of connected customer technology. If you enjoy working on complex systems, bringing clarity to areas of technical uncertainty, and having real influence over architectural decisions early on, this is a role where your impact will be felt quickly and meaningfully. You will play a critical role in providing technical cover across the orchestration layer of our platform, which is currently the area of highest risk and opportunity. From day one, the priority is reducing risk, supporting delivery at scale, and helping the wider team gain confidence in the codebase and future direction of the platform. What you receive for joining us We believe in rewarding expertise and accountability, which is why we offer an excellent salary. This includes 25 days holiday plus bank holidays, an additional day off for your birthday, a collaborative and supportive working environment, and the opportunity to work closely with senior leaders who value clarity, technical judgement, and delivery. Here is a look at some of the things you will be doing Supporting and contributing to the Ruby on Rails orchestration layer, helping to reduce technical risk and ensure the platform is robust, scalable, and well understood Supporting the team through a period of significant scale, providing hands-on technical expertise to stabilise, improve, and evolve the existing codebase Working closely with stakeholders to help secure the technical foundations needed for Complii s future vision of connected customer technology Contributing to architectural decisions, code quality, and best practices, while accelerating delivery and confidence across the engineering function Can you show experience in some of these areas Strong experience using the Ruby on Rails framework, with supporting knowledge of technologies such as Postgres, Redis, Sidekiq/ActiveJob, and HTML/jQuery Experience designing and working with APIs, including third-party integrations, and deploying applications using Heroku or similar PaaS providers A pragmatic approach to problem-solving, with a focus on simplicity, risk reduction, and building solid technical foundations A collaborative mindset, strong communication skills, and the ability to make a tangible impact within the first 90 days If you feel you have the skills and drive to make an impact, even if you don t meet every requirement above, we d still love to hear from you. Complii is a leading integrated provider of safety and regulatory compliance services across our water, air, fire, and electrical divisions, supporting organisations nationwide to operate safely, compliantly, and responsibly. This is a fully remote role and can be based anywhere in the UK, offering the opportunity to shape a critical platform and make a lasting difference.
Feb 01, 2026
Full time
At Complii, we are on the lookout for a Senior Developer to play a key role in strengthening and scaling a business-critical technology platform. This role is focused on reducing risk, supporting significant scale, and helping secure the technical foundations needed to deliver our long-term vision of connected customer technology. If you enjoy working on complex systems, bringing clarity to areas of technical uncertainty, and having real influence over architectural decisions early on, this is a role where your impact will be felt quickly and meaningfully. You will play a critical role in providing technical cover across the orchestration layer of our platform, which is currently the area of highest risk and opportunity. From day one, the priority is reducing risk, supporting delivery at scale, and helping the wider team gain confidence in the codebase and future direction of the platform. What you receive for joining us We believe in rewarding expertise and accountability, which is why we offer an excellent salary. This includes 25 days holiday plus bank holidays, an additional day off for your birthday, a collaborative and supportive working environment, and the opportunity to work closely with senior leaders who value clarity, technical judgement, and delivery. Here is a look at some of the things you will be doing Supporting and contributing to the Ruby on Rails orchestration layer, helping to reduce technical risk and ensure the platform is robust, scalable, and well understood Supporting the team through a period of significant scale, providing hands-on technical expertise to stabilise, improve, and evolve the existing codebase Working closely with stakeholders to help secure the technical foundations needed for Complii s future vision of connected customer technology Contributing to architectural decisions, code quality, and best practices, while accelerating delivery and confidence across the engineering function Can you show experience in some of these areas Strong experience using the Ruby on Rails framework, with supporting knowledge of technologies such as Postgres, Redis, Sidekiq/ActiveJob, and HTML/jQuery Experience designing and working with APIs, including third-party integrations, and deploying applications using Heroku or similar PaaS providers A pragmatic approach to problem-solving, with a focus on simplicity, risk reduction, and building solid technical foundations A collaborative mindset, strong communication skills, and the ability to make a tangible impact within the first 90 days If you feel you have the skills and drive to make an impact, even if you don t meet every requirement above, we d still love to hear from you. Complii is a leading integrated provider of safety and regulatory compliance services across our water, air, fire, and electrical divisions, supporting organisations nationwide to operate safely, compliantly, and responsibly. This is a fully remote role and can be based anywhere in the UK, offering the opportunity to shape a critical platform and make a lasting difference.
At Complii, we are on the lookout for a Senior Developer to play a key role in strengthening and scaling a business-critical technology platform. This role is focused on reducing risk, supporting significant scale, and helping secure the technical foundations needed to deliver our long-term vision of connected customer technology. If you enjoy working on complex systems, bringing clarity to areas of technical uncertainty, and having real influence over architectural decisions early on, this is a role where your impact will be felt quickly and meaningfully. You will play a critical role in providing technical cover across the orchestration layer of our platform, which is currently the area of highest risk and opportunity. From day one, the priority is reducing risk, supporting delivery at scale, and helping the wider team gain confidence in the codebase and future direction of the platform. What you receive for joining us We believe in rewarding expertise and accountability, which is why we offer an excellent salary. This includes 25 days holiday plus bank holidays, an additional day off for your birthday, a collaborative and supportive working environment, and the opportunity to work closely with senior leaders who value clarity, technical judgement, and delivery. Here is a look at some of the things you will be doing Supporting and contributing to the Ruby on Rails orchestration layer, helping to reduce technical risk and ensure the platform is robust, scalable, and well understood Supporting the team through a period of significant scale, providing hands-on technical expertise to stabilise, improve, and evolve the existing codebase Working closely with stakeholders to help secure the technical foundations needed for Complii s future vision of connected customer technology Contributing to architectural decisions, code quality, and best practices, while accelerating delivery and confidence across the engineering function Can you show experience in some of these areas Strong experience using the Ruby on Rails framework, with supporting knowledge of technologies such as Postgres, Redis, Sidekiq/ActiveJob, and HTML/jQuery Experience designing and working with APIs, including third-party integrations, and deploying applications using Heroku or similar PaaS providers A pragmatic approach to problem-solving, with a focus on simplicity, risk reduction, and building solid technical foundations A collaborative mindset, strong communication skills, and the ability to make a tangible impact within the first 90 days If you feel you have the skills and drive to make an impact, even if you don t meet every requirement above, we d still love to hear from you. Complii is a leading integrated provider of safety and regulatory compliance services across our water, air, fire, and electrical divisions, supporting organisations nationwide to operate safely, compliantly, and responsibly. This is a fully remote role and can be based anywhere in the UK, offering the opportunity to shape a critical platform and make a lasting difference.
Jan 31, 2026
Full time
At Complii, we are on the lookout for a Senior Developer to play a key role in strengthening and scaling a business-critical technology platform. This role is focused on reducing risk, supporting significant scale, and helping secure the technical foundations needed to deliver our long-term vision of connected customer technology. If you enjoy working on complex systems, bringing clarity to areas of technical uncertainty, and having real influence over architectural decisions early on, this is a role where your impact will be felt quickly and meaningfully. You will play a critical role in providing technical cover across the orchestration layer of our platform, which is currently the area of highest risk and opportunity. From day one, the priority is reducing risk, supporting delivery at scale, and helping the wider team gain confidence in the codebase and future direction of the platform. What you receive for joining us We believe in rewarding expertise and accountability, which is why we offer an excellent salary. This includes 25 days holiday plus bank holidays, an additional day off for your birthday, a collaborative and supportive working environment, and the opportunity to work closely with senior leaders who value clarity, technical judgement, and delivery. Here is a look at some of the things you will be doing Supporting and contributing to the Ruby on Rails orchestration layer, helping to reduce technical risk and ensure the platform is robust, scalable, and well understood Supporting the team through a period of significant scale, providing hands-on technical expertise to stabilise, improve, and evolve the existing codebase Working closely with stakeholders to help secure the technical foundations needed for Complii s future vision of connected customer technology Contributing to architectural decisions, code quality, and best practices, while accelerating delivery and confidence across the engineering function Can you show experience in some of these areas Strong experience using the Ruby on Rails framework, with supporting knowledge of technologies such as Postgres, Redis, Sidekiq/ActiveJob, and HTML/jQuery Experience designing and working with APIs, including third-party integrations, and deploying applications using Heroku or similar PaaS providers A pragmatic approach to problem-solving, with a focus on simplicity, risk reduction, and building solid technical foundations A collaborative mindset, strong communication skills, and the ability to make a tangible impact within the first 90 days If you feel you have the skills and drive to make an impact, even if you don t meet every requirement above, we d still love to hear from you. Complii is a leading integrated provider of safety and regulatory compliance services across our water, air, fire, and electrical divisions, supporting organisations nationwide to operate safely, compliantly, and responsibly. This is a fully remote role and can be based anywhere in the UK, offering the opportunity to shape a critical platform and make a lasting difference.
Software Developer (Ruby) Inside IR35 Contract Senior or Consultant level Initial 3-month contract starting ASAP Tech stack/skills required: Ruby specialist Prior gov experience will be prioritised but not essential Available to interview and start at short notice SC required (active or eligibility & willing to apply)
Jan 30, 2026
Contractor
Software Developer (Ruby) Inside IR35 Contract Senior or Consultant level Initial 3-month contract starting ASAP Tech stack/skills required: Ruby specialist Prior gov experience will be prioritised but not essential Available to interview and start at short notice SC required (active or eligibility & willing to apply)
An exciting opportunity has arisen for a Senior Software Engineer to join a well-established biotech company using large-scale genetic data and AI to predict disease risk and advance precision healthcare. As a Senior Software Engineer, you will be contributing to the development and scaling of secure, reliable software in a collaborative, agile environment. This is a contract-based role (12 weeks) offering hybrid / remote working options, a salary range of £500 - £700 per day (Inside IR35) and benefits. You will be responsible for: Building and scaling new software products within an agile squad. Supporting the delivery of innovative health-tech services that positively impact society. Collaborating closely with cross-functional teams including product, UX, and engineering leads. Applying engineering expertise across backend and full-stack development. What we are looking for Previously worked as a Software Engineer, Backend Engineer, Full Stack Developer, Backend Developer, Cloud Engineer, Python Developer, Node.js Developer, Platform Engineer, Infrastructure Engineer or in a similar role. Strong background in cloud-hosted web applications and backend services. Expertise in Node.js, Ruby on Rails, Python; knowledge of Golang or Typescript is advantageous. Experience with agile methodologies, Git, and GitHub workflows. Competence in developing and maintaining large-scale web applications, both frontend and backend. Familiarity with CI/CD pipelines, test-driven development, and code reviews. Proficient in data modelling and relational databases such as PostgreSQL. Experience with Infrastructure as Code, particularly Terraform. Knowledge of cloud platforms including Azure (preferred), AWS, or GCP. Understanding of security and regulatory requirements in software design. This is a unique opportunity to join a forward-thinking tech team and make a tangible difference. Apply now to be part of this exciting venture. Important Information: We endeavour to process your personal data in a fair and transparent manner. In applying for this role, Additional Resources will be acting in your best interest and may contact you in relation to the role, either by email, phone, or text message. For more information see our Privacy Policy on our website. It is important you are aware of your individual rights and the provisions the company has put in place to protect your data. If you would like further information on the policy or GDPR please contact us. Additional Resources Ltd is an Employment Business and an Employment Agency as defined within The Conduct of Employment Agencies & Employment Businesses Regulations 2003.
Jan 09, 2026
Contractor
An exciting opportunity has arisen for a Senior Software Engineer to join a well-established biotech company using large-scale genetic data and AI to predict disease risk and advance precision healthcare. As a Senior Software Engineer, you will be contributing to the development and scaling of secure, reliable software in a collaborative, agile environment. This is a contract-based role (12 weeks) offering hybrid / remote working options, a salary range of £500 - £700 per day (Inside IR35) and benefits. You will be responsible for: Building and scaling new software products within an agile squad. Supporting the delivery of innovative health-tech services that positively impact society. Collaborating closely with cross-functional teams including product, UX, and engineering leads. Applying engineering expertise across backend and full-stack development. What we are looking for Previously worked as a Software Engineer, Backend Engineer, Full Stack Developer, Backend Developer, Cloud Engineer, Python Developer, Node.js Developer, Platform Engineer, Infrastructure Engineer or in a similar role. Strong background in cloud-hosted web applications and backend services. Expertise in Node.js, Ruby on Rails, Python; knowledge of Golang or Typescript is advantageous. Experience with agile methodologies, Git, and GitHub workflows. Competence in developing and maintaining large-scale web applications, both frontend and backend. Familiarity with CI/CD pipelines, test-driven development, and code reviews. Proficient in data modelling and relational databases such as PostgreSQL. Experience with Infrastructure as Code, particularly Terraform. Knowledge of cloud platforms including Azure (preferred), AWS, or GCP. Understanding of security and regulatory requirements in software design. This is a unique opportunity to join a forward-thinking tech team and make a tangible difference. Apply now to be part of this exciting venture. Important Information: We endeavour to process your personal data in a fair and transparent manner. In applying for this role, Additional Resources will be acting in your best interest and may contact you in relation to the role, either by email, phone, or text message. For more information see our Privacy Policy on our website. It is important you are aware of your individual rights and the provisions the company has put in place to protect your data. If you would like further information on the policy or GDPR please contact us. Additional Resources Ltd is an Employment Business and an Employment Agency as defined within The Conduct of Employment Agencies & Employment Businesses Regulations 2003.
