Senior Full-Stack Engineer (Node.js/React) – Sustainable Tech Unicorn (Cequeliños)

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 ...