MarsBased is a development agency from Barcelona offering end‑to‑end web & mobile apps built with Ruby on Rails, React and JavaScript. We believe in remote work, clean code, and delivering quality over quantity
We’re looking for a senior full-stack engineer to join our Martian team, with strong knowledge of Node.js and React.
You’ll be joining a small, senior, and highly-collaborative team that values autonomy, quality, and transparency. We build things the right way. We believe in doing deep, focused work — not meetings all day.
If you love elegant code, solving complex problems, and being part of a kind and experienced remote team, this might be your next orbit.
WHAT YOU'LL DO
- Build and maintain modern, scalable web applications using Node.js, React, and Next.js. - Collaborate closely with clients and teammates in a friendly, remote-first environment. - Contribute to architecture decisions and ensure clean, maintainable codebases. - Use AI-assisted coding tools to improve development speed and quality. - Help us refine our internal tools, workflows, and development culture.
GENERAL SKILLS
- Excellent communication with clients and teammates. - Strong self-management skills for remote work. - High attention to detail. - Positive attitude towards new challenges and a fast learner. - Proactive and able to work independently on self-managed projects. - Experience using AI agents or AI code editors to assist in coding tasks. - Fluent in written and spoken Spanish. - Fluent in written and spoken English.
TECH SKILLS
- 5+ years of production experience building Node.js and React applications. - Production experience with Next.js, the App Router, and Server Components is required. - Experience with React Router or Remix (nice to have). - Strong JavaScript and TypeScript knowledge, both frontend and backend. - Solid understanding of relational databases and SQL. - Production experience deploying and maintaining Node.js applications. - Familiar with Docker and containers in both development and production environments. - Experience with testing frameworks such as Jest or Cypress. - Ability to build scalable and maintainable software over time. - Strong writing and documentation skills, we value clarity in your code and solutions.
BENEFITS
- Competitive salary. - Work from home or from a coworking space. - Adaptable working hours. - Amazing coworkers. - Modern tech stack and methodologies. - Transparency and quality-oriented culture. - Company activities.
WHY MARSBASED
We’re a boutique agency, not a factory. We work with clients who respect our time, process, and craftsmanship. You’ll be part of a senior team where your voice matters and your work has a real impact.
Join us and help us build software that lasts — from Mars, or anywhere you call home ❤️