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

📌 Senior Ruby on Rails Engineer (Madrid)
🏢 David Kennedy Recruitment
📍 Madrid