Salary: £37,000 - 77,000 per year Requirements: Strong experience using the Ruby on Rails framework Supporting knowledge of technologies such as Postgres, Redis, Sidekiq/ActiveJob, and HTML/jQuery Experience designing and working with APIs, including third-party integrations Deploying applications using Heroku or similar PaaS providers Pragmatic approach to problem-solving with a focus on simplicity and risk reduction Collaborative mindset and strong communication skills Ability to make a tangible impact within the first 90 days Responsibilities: Supporting and contributing to the Ruby on Rails orchestration layer Helping to reduce technical risk and ensure the platform is robust and scalable Providing hands-on technical expertise to stabilize and improve the existing codebase Working closely with stakeholders to secure the technical foundations for Compliis future vision Contributing to architectural decisions, code quality, and best practices Accelerating delivery and confidence across the engineering function Technologies: Heroku Support PaaS Rails Redis Ruby jQuery More: At Complii, we are on the lookout for a Senior Developer to play a key role in strengthening and scaling our business-critical technology platform. We believe in rewarding expertise and accountability, offering an excellent salary, 25 days holiday plus bank holidays, an additional day off for your birthday, and a collaborative working environment. This is a fully remote role based anywhere in the UK, providing an opportunity to make a lasting difference in shaping a critical platform and advancing our mission to support organizations nationwide in operating safely, compliantly, and responsibly. last updated 5 week of 2026