Senior Full-Stack Engineer (Node.Js/React) - Sustainable Tech Unicorn (Madrid)

About the client

A German Sustainable Tech Unicorn that is redefining how integral corporations handle transparency. Backed by a €130M Series C investment, our client has built a proprietary, serverless cloud infrastructure to ensure human rights and ecological responsibility across global supply chains. Currently in a massive consolidation phase, their Madrid Hub is expanding from 20 to over 100 top‑tier engineers in 2026. This is your chance to join a high‑growth environment where engineering quality and product ownership are the top priorities.

Key Responsibilities

• Design and optimize scalable full‑stack features, focusing on robust backend systems and high-performance frontend interfaces.
• Work directly on a custom-built, serverless cloud ecosystem (the Hub).
• Influence the design of core libraries and microservices architecture used worldwide.
• Collaborate in high-density agile squads (4-6 people) alongside tech leads to define the product roadmap.
• Drive technical excellence through rigorous code reviews, automated testing, and CI/CD best practices.

Your Profile

• 6+ years of professional experience in Full‑Stack development within product-based companies.
• Expert-level command of Node.Js and TypeScript.
• Strong experience with React.Js.
• Deep understanding of microservices, end‑to‑end product ownership, and scalable design patterns.
• Fluent English (C1). Spanish is a plus but not mandatory.

What’s in it for you

• Unlimited Growth: Join a unicorn at the peak of its global expansion with a direct line to leadership.
• Good Salary Package.
• Hybrid Work: 3 days in the Madrid office / 2 days remote.
• Premium Benefits: €80/month via Thanksben + up to €200/month for transport and meals. xhfqzwm
• High‑Performance Culture: A world‑class engineering team where technical decisions are made by developers, for developers.

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