Senior Ruby on Rails Engineer

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Ruby on Rails Engineer based in the United States. Join a fast-growing AI technology environment building scalable applications for a global user base. As a Senior Ruby on Rails Engineer, you will develop new features, enhance existing functionality, and help improve the performance and reliability of AI-powered products. You will collaborate closely with engineering leadership, product managers, and distributed technical teams to turn product requirements into effective solutions. This hands-on individual contributor role offers opportunities to influence technical decisions and take ownership of features from conception through deployment. You will work with a modern technology stack while balancing code quality, scalability, and delivery speed. The position is fully remote, with a strong emphasis on autonomy, collaboration, and continuous improvement.

You will contribute to the design, development, and continuous improvement of production applications, ensuring that technical solutions support product objectives and deliver reliable user experiences. Design, develop, and maintain scalable backend applications using Ruby on Rails. Build new product features and improve existing platform functionality. Collaborate with product managers to translate requirements into technical solutions and estimate development efforts. Write clean, maintainable, well-tested code suitable for production environments. Participate in code reviews, testing, and technical decision-making. Troubleshoot technical issues and improve application performance, reliability, and scalability. Take ownership of features throughout the development lifecycle, from requirements and implementation to testing and deployment. Work closely with distributed engineering, product, and infrastructure teams to deliver high-quality solutions. Contribute to continuous improvement in development practices, tooling, and engineering workflows. Requirements: The ideal candidate will bring substantial hands-on Ruby on Rails experience, a strong understanding of production software development, and the ability to deliver robust solutions in a fast-paced environment. At least 5 years of commercial experience in backend or full-stack software engineering. Strong practical experience with Ruby on Rails, preferably recent experience building and maintaining production applications. Demonstrated ability to develop and scale applications used by real customers. Experience owning features from initial requirements through development, testing, and deployment. Previous experience in a startup, scale-up, or similarly fast-moving environment. Strong problem-solving skills and the ability to balance code quality with delivery speed. Excellent English communication skills and experience collaborating with international teams. Willingness and comfort working with uncensored AI companionship products and explicit NSFW content. Technical Stack: Ruby on Rails PostgreSQL Redis Hotwire, including Turbo and Stimulus Tailwind CSS Preferred Qualifications: Experience with generative AI, large language models (LLMs), natural language processing (NLP), or machine learning. Familiarity with modern Rails development practices and AI-assisted coding tools. Experience working with globally distributed engineering teams. Benefits: Annual salary of €75,000–€105,000, depending on location and experience. Fully remote working arrangement. Flexible B2B contract options, with B2B preferred. 20 days of paid annual leave. Learning and development budget. Health and well-being support. Company-provided laptop and equipment. Access to AI development tools, including Cursor, Claude Code, and ChatGPT. Direct collaboration with senior engineering leadership. Opportunity to influence technical decisions and product development. Annual company gathering.