Senior Ruby Engineer

Senior Ruby Engineer Fully Remote B2B Contract Salary up to €105K Annually Gross. Our client is looking for a Senior Ruby Engineer to join a fast-growing, international technology company building a high-traffic AI-powered consumer product used by millions of users worldwide. This is a fully remote, hands-on engineering role for someone who enjoys working at scale, taking ownership, and solving challenging backend problems in a fast-moving environment. What you'll be doing - Design, build, and maintain scalable backend systems using Ruby on Rails - Work on high-traffic, production-grade applications serving millions of users - Contribute to architectural decisions and scaling initiatives - Identify and solve complex performance and reliability challenges - Take ownership of features from conception through production - Collaborate closely with Product, Design, QA, AI, and DevOps teams - Work in a fast-paced environment where engineers have significant autonomy - Use modern AI-powered development tools as part of your engineering workflow What we're looking for - 5+ years of backend engineering experience - Strong professional experience with Ruby on Rails - Experience building and operating high-traffic, scalable production systems - Strong understanding of web fundamentals, backend architecture, and performance optimisation - Experience with monolithic architectures and/or scaling challenges - Proven ability to take ownership and make technical decisions independently - Experience working in a startup or scale-up environment is highly desirable - Comfortable collaborating within cross-functional engineering teams - Strong communication skills in English - Actively uses AI tools such as ChatGPT, GitHub Copilot, Cursor, Claude, or similar in development - Comfortable working within CET ±3 hours Benefits - Fully remote - work from anywhere within the relevant European time zones - B2B contract only - Compensation of up to €105,000 per year - High-impact work on a product operating at significant international scale - A highly autonomous environment with real engineering ownership - Fast-paced, collaborative international team - Opportunity to work with modern AI technologies and development practices ⚠️ Important This role involves working on a consumer product that includes adult-oriented/NSFW content. Candidates must be fully comfortable working professionally in this environment. If you're a Senior Ruby Engineer who enjoys scale, ownership, autonomy, and fast-moving product environments, we'd love to hear from you.