Full Stack Engineer

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 ❤️