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Senior Ruby on Rails DeveloperWe are working with a fast-growing, well-invested SaaS company that has been helping organisations manage information security and regulatory compliance since 2005. Its platform is used by more than 65,000 people across the UK, Europe, the US and APAC.The business is scaling quickly and is building a team that cares about delivering compliance technology properly, with a focus on strong engineering, practical process and scalable product development.The Role They are hiring a Senior Ruby on Rails Developer to join their backend engineering team. This is a senior individual contributor role with leadership expectations, working closely with the Tech Lead to deliver roadmap work, improve architecture where needed and help shape how AI is used across engineering in a practical, measurable way.The role suits someone who is comfortable working in a mature Rails monolith, can move between legacy and modern patterns without drama and is motivated by making a real contribution in a small, capable team.What you will be doing Building and maintaining product features in Ruby on RailsContributing to architecture decisions and helping evolve the platform over timeImproving performance, maintainability and developer productivitySupporting the team with code review, pairing, technical planning and mentoringHelping define and improve AI-augmented engineering workflows The Stack The core platform is a mature Ruby on Rails application using Rails 8.1, Ruby 4.x, MySQL 8, GitHub Actions, Cypress, Turbo, StimulusJS, dry-rb libraries, Action Policy, RailsEventStore, DelayJob, New Relic, JIRA and Confluence.The engineering roadmap includes moving ERB toward Phlex, Solr toward ElasticSearch or OpenSearch, component separation via Packwerk and wider use of AI-augmented workflows across engineering.AI and Engineering This company is serious about using AI to improve speed, quality and leverage across engineering. They are looking for someone who already uses AI regularly in engineering work, including coding, refactoring, testing, documentation and workflow improvement.This could include practical use of tools such as OpenAI Codex, Claude Code, GitHub Copilot or similar AI engineering tools. You should understand where AI can improve delivery and productivity, but also where strong engineering judgement is still essential.What They Are Looking For 5+ years of relevant Ruby on Rails experienceStrong Ruby fundamentals and sound object-oriented designExperience working effectively in a mature monolith codebaseStrong SQL skills, with confidence writing and understanding queriesTesting experience across unit, integration and end-to-end levelsExperience contributing to architecture and technical directionHigh autonomy, initiative, product awareness and strong communication skillsDaily, practical use of AI coding toolsExperience with Stimulus, Turbo, Hotwire, event-driven architecture, security, compliance, ISO 27001, agentic workflows, automation design or AI evals would be useful, but is not essential.Why Apply? This is a great opportunity to join a growing, well-invested SaaS business where the role has real scope, responsibility and influence.You will be joining a small engineering organisation that values people who can contribute beyond the ticket in front of them, collaborate well and help improve how engineering works. The business has strong processes in place, including backlog reviews, product workshops, technical workshops, sprint planning, demos and retrospectives, without being overly bureaucratic.This is a remote UK role with a focus on output, ownership and meaningful technical contribution.