> Markdown version of [/jobs/ext/2762736-senior-backend-engineer-node-js-react-sustainable-tech-unicorn](https://www.wearedevelopers.com/jobs/ext/2762736-senior-backend-engineer-node-js-react-sustainable-tech-unicorn). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Backend Engineer (Node.Js/React) Sustainable Tech Unicorn - **Company:** Actual Talent - **Location:** Madrid, Spain (Remote available) - **Contract:** Permanent contract - **Skills:** Automation of Tests, Cloud Computing, Code Review, Continuous Integration, Modular Design, Node.Js, Systems Architecture, TypeScript, ReactJS, Backend, Front End Software Development, Serverless Computing, Microservices - **Published:** September 6, 2026 - **Apply:** https://www.buscojobs.com.es/senior-backend-engineer-node-js-react-sustainable-tech-unicorn-en-madrid-ID-370102840 ## About the Role 6+ years of professional experience in Backend development, specifically within product-based companies (no agencies or consultancies). Backend Mastery: Expert-level command of Node.js and TypeScript . 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. ## Description Actual Talentis the talent acquisition consultancy that offers Executive Search, RPO and Talent Solutions.About the client:AGerman Sustainable Tech Unicornthat is redefining how global corporations handle transparency. Backed by a€130M Series Cinvestment, 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 ****. This is your chance to join a high-growth environment where engineering quality and product ownership are the top priorities.The Mission: Impact at ScaleAs 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:eExperience:6+ years of professional experience in Backend development, specifically withinproduct-based companies(no agencies or consultancies).Backend Mastery:Expert-level command ofNode.jsandTypeScript.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.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 PackageHybrid Work:A balanced model of3 days in the Madrid office / 2 days remotePremium 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. ## Related Videos - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Stop using Node.js like in 2020! What changed and what you can do today with Node.js](https://www.wearedevelopers.com/videos/100011-stop-using-node-js-like-in-2020-what-changed-and-what-you-can-do-today-with-node-js) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development)