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.
* Flexible 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