Senior Ruby on Rails Engineer

David Kennedy Recruitment is working with a fast-growing AI technology company serving millions of users worldwide that is seeking to onboard a Senior Ruby on Rails Engineer to join their R&D / Engineering team. This is a hands-on individual contributor role, helping design, build and scale core applications while working alongside the CTO, Tech Lead, Product Managers and SREs.

The company's products include adult/NSFW content, so candidates must be fully comfortable working on them. Position: Senior Ruby on Rails Engineer Location: Europe, Remote Employment type: B2B engagement DUTIES AND RESPONSIBILITIES: Design, develop and maintain scalable backend applications using Ruby on Rails Collaborate with Product Managers to review requirements and translate specifications into technical solutions Prepare technical integration plans, development breakdowns and effort estimates Implement new features and improve existing platform functionality Write clean, maintainable, well-tested production code Take part in pull requests, peer code reviews and testing Troubleshoot application issues and improve reliability, performance and scalability Contribute to technical decision-making and product roadmap discussions Experiment with technologies and approaches that improve product functionality and user experience Work with distributed engineering, infrastructure and product teams REQUIREMENTS: 5+ years' commercial experience as a Backend or Full-Stack Software Engineer Strong, recent hands-on Ruby on Rails experience in production Ability to independently design and implement complex backend features Experience on applications serving thousands or more monthly active users, with an understanding of building reliable, scalable systems Experience in technology scale-ups, startups or similarly agile environments, comfortable with changing priorities and tight deadlines Proven ability to take features from requirements through development, testing and production Excellent spoken and written English, and comfortable working with international remote teams Based in Europe, with CET ±3 hours working overlap Fully comfortable working on AI companionship products involving uncensored and NSFW content BENEFITS: 100% remote working, with a B2B contract 20 working days of paid time off annually Annual company gathering Health and wellbeing support Learning and professional development budget Company laptop and equipment support Access to AI development tools, including Cursor, Claude Code and ChatGPT Direct collaboration with experienced engineering leadership and the chance to influence technical decisions And many more!!!