Mars Based is a
development agency
from Barcelona offering end‑to‑end web & mobile apps built with
Ruby on Rails,
React
and
Java Script. 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
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, React, and 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 and React applications. Production experience with, the App Router, and Server Components is required. Experience with React Router or Remix (nice to have). Strong Java Script and Type Script knowledge, both frontend and backend.
Solid understanding of relational databases and SQL. Production experience deploying and maintaining 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. Versátil 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