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

**Actual Talent** is the talent acquisition consultancy that offers Executive Search, RPO and Talent Solutions.

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**About the client

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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.

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### **The Mission

Impact at Scale**

As a Senior Full-Stack Engineer 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

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**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.

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### **Your Profile

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**Experience

** 6+ years of professional experience in Full-Stack development, specifically within **product-based companies** (no agencies or consultancies).

**Backend Mastery

** Expert-level command of **Node.js** and **TypeScript**.

**Frontend Proficiency

** Strong experience with **React.js**.

**Architecture Mindset

** Deep understanding of microservices, end-to-end product ownership, and scalable design patterns.

**Communication

** Fluent English (C1). Spanish is a plus but not mandatory for technical collaboration.

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### **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

** A balanced model of **3 days in the Madrid office / 2 days remote**

**Premium Benefits

** €80/month via Thanksben + up to €200/month for transport and meals.

**High-Performance Culture

** A world-class engineering team where technical decisions are made by developers, for developers.