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Location: Fully remote – Europe (CET ±3 hours) Salary: €75,000–€105,000/year, depending on location and experience Contract: B2B preferred, flexible Experience: 5+ years Important: Must be comfortable working with explicit NSFW content. About the Role We’re looking for an experienced Senior Ruby on Rails Engineer to join a fast-growing AI technology company behind an AI companionship platform used by millions worldwide. You’ll work on scalable, AI-powered applications, developing new features and improving existing functionality alongside the CTO, Tech Lead and wider engineering team. This is a hands-on individual contributor role for someone who enjoys coding, taking ownership and delivering high-quality solutions in a fast-moving environment. Key Responsibilities Design, develop and maintain scalable backend applications using Ruby on Rails. Build new features and improve existing platform functionality. Work with Product Managers to translate requirements into technical solutions and estimate development efforts. Write clean, maintainable, well-tested production code. Participate in code reviews, testing and technical decision-making. Troubleshoot issues and improve application performance, reliability and scalability. Collaborate with distributed engineering, product and infrastructure teams. Requirements 5+ years of commercial experience in backend or full-stack software engineering. Strong, hands-on Ruby on Rails experience, ideally recent and in production. Experience building and scaling production applications with real users. Ability to take ownership of features from requirements through development, testing and deployment. Previous experience in a startup, scale-up or similarly fast-paced environment. Strong problem-solving skills and the ability to balance code quality with delivery speed. Excellent English and experience working with international teams. Full comfort working with uncensored AI companionship products and explicit NSFW content. Tech Stack Ruby on Rails, PostgreSQL, Redis, Hotwire (Turbo and Stimulus) and Tailwind CSS. Nice to Have Experience with generative AI, LLMs, NLP or machine learning. Familiarity with modern Rails development practices and AI-assisted coding tools. Experience working with globally distributed engineering teams. What’s on Offer? 100% remote working. Competitive salary, depending on location and experience. Direct collaboration with senior engineering leadership. Opportunity to influence technical decisions and product development. 20 days of paid annual leave. Learning and development budget, health and wellbeing support. Company laptop and equipment. Access to AI development tools, including Cursor, Claude Code and ChatGPT. Annual company gathering.