Senior Backend Engineer (Node.js/React) – Sustainable Tech Unicorn

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About the client:
A German Sustainable Tech Unicorn that is redefining how global 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.
The Mission: Impact at Scale
As a Senior Backend Enginner you will be an architect of transparency. You will own the end-to-end development of products that help over 2,000 global companies comply with critical ESG regulations (LkSG, CSDDD).
Key Responsibilities:
System Architecture: Design and optimize scalable full-stack features, focusing on robust backend systems and high-performance frontend interfaces.
Infrastructure Innovation: Work directly on a custom-built, serverless cloud ecosystem (the Hub).
Technical Leadership: Influence the design of core libraries and microservices architecture used worldwide.
Collaborative Strategy: Work in high-density agile squads (4-6 people) alongside tech leads to define the product roadmap.
Quality Advocacy: Drive technical excellence through rigorous code reviews, automated testing, and CI/CD best practices.
Your Profile:e
Experience: 6 years of professional experience in Backend development, spe