Location: Fully remote – Europe (CET ±3 hours)
Salary: €75,000–€105,000/year, depending on location and experience
Contract: B2B preferred, adaptable
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.

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📌 Senior Ruby On Rails Engineer (Remote) (Madrid)
🏢 Recruiter4you
📍 Madrid