Full Stack Developer (remote or hybrid)

MarsBased; Madrid; A distancia; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A web development agency in Madrid is seeking a senior full-stack engineer with strong Node.js and React expertise. This role involves building scalable web applications, collaborating with a friendly team in a remote-first environment. Candidates should have over 5 years of experience, fluency in Spanish and English, and familiarity with AI coding tools. Join a team where your voice matters and contribute to impactful work in a transparent culture.

Servicios

Flexible working hours

Transparency and quality-oriented culture

Work from home or coworking space

Formación

• 5+ years of production experience building Node.js and React applications.
• Production experience with Next.js, the App Router, and Server Components.
• Experience with React Router or Remix is a plus.
• Strong writing and documentation skills required.

Responsabilidades

• 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.
• Use AI-assisted coding tools to improve development speed and quality.

Conocimientos

Self-management for remote work

Proactive work style

Node.js application development

React application development

Fluent in Spanish

Fluent in English

Next.js

A.I. coding tools

JavaScript

TypeScript

Relational databases

Docker knowledge

Testing frameworks

Descripción del empleo

Overview

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.

From Mars, or anywhere you call home ❤️

Responsibilities

• 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.
• Use AI-assisted coding tools to improve development speed and quality.

General Skills & Qualifications

• Strong self-management skills for remote work.
• 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.
• 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.

Work from home or from a coworking space. Flexible working hours. Transparency and quality-oriented culture.

We’re a boutique agency, not a factory. You’ll be part of a senior team where your voice matters and your work has a real impact.