Full Stack Engineer

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 ️

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