Senior Ruby On Rails Engineer (Remote)

Recruiter4you; Barcelona; Remote; EUR 75,000 - 105,000; Full time

Benefits offered by this job

100% remote working

Competitive salary (€75k–€105k)

Direct collaboration with senior tech

20 days of paid annual leave

Learning and development budget

Company laptop and equipment

Access to AI development tools

Annual company gathering

Job summary

Recruiter4you is seeking a Senior Ruby on Rails Engineer to join a fast-growing AI company behind an AI companionship platform. This is a fully remote role across Europe, with salary €75,000–€105,000 per year.

You will design, develop and scale backend services using Ruby on Rails, collaborating with the CTO, Tech Lead and distributed teams. You’ll own features from concept to deployment, write clean tests, and help shape the product as it grows.

Qualifications

• 5+ years of backend or full-stack software engineering experience.
• Strong, hands-on Ruby on Rails in production.
• Experience building and scaling production apps with real users.
• Ability to own features from requirements through deployment.
• Startup/scale-up experience in a fast-paced environment.
• Strong problem-solving with balance between code quality and speed.
• Excellent English and experience with international teams.
• Comfort with uncensored NSFW content in products.

Responsibilities

• Design, develop and maintain scalable backend applications with Ruby on Rails.
• Build new features and improve platform functionality.
• Collaborate with Product Managers to translate requirements into technical solutions.
• Write clean, well-tested production code.
• Participate in code reviews, testing and technical decision-making.
• Troubleshoot issues and improve performance, reliability and scalability.
• Collaborate with distributed engineering, product and infrastructure teams.

Skills

Ruby on Rails

Backend/Full-stack development

Ownership

Problem solving

English communication

Tools

PostgreSQL

Redis

Hotwire

Tailwind CSS

AI tools (Cursor, Claude Code, ChatGPT)

Job description

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.