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

Actual Talent is the talent acquisition consultancy that offers Executive Search, RPO and Talent Solutions.About the clientA German Sustainable Tech Unicorn that is redefining how global corporations handle transparency.Backed by a €130M Series C investment, the client has built a proprietary, serverless cloud infrastructure to ensure human rights and ecological responsibility across global supply chains.Their Madrid Hub is expanding from 20 to over 100 top?tier engineers in ****, creating a high?growth environment where engineering quality and product ownership are top priorities.The Mission: Impact at ScaleAs a Senior Full?Stack Engineer you will be an architect of transparency, owning the end?to?end development of products that help over 2,000 general companies comply with critical ESG regulations (LkSG, CSDDD).Key ResponsibilitiesSystem 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 ProfileExperience: 6+ years of professional experience in Full?Stack development 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.BenefitsUnlimited 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.#J-*****-Ljbffr

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 ProfileExperience: 6+ years of professional experience in Full?Stack development 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.BenefitsUnlimited 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. #J-*****-Ljbffr

Actual Talent is the talent acquisition consultancy that offers Executive Search, RPO and Talent Solutions.About the clientA German Sustainable Tech Unicorn that is redefining how global corporations handle transparency. Backed by a €130M Series C investment, the client has built a proprietary, serverless cloud infrastructure to ensure human rights and ecological responsibility across global supply chains. Their Madrid Hub is expanding from 20 to over 100 top?tier engineers in ****, creating a high?growth environment where engineering quality and product ownership are top priorities.The Mission: Impact at ScaleAs a Senior Full?Stack Engineer you will be an architect of transparency, owning the end?to?end development of products that help over 2,000 general companies comply with critical ESG regulations (LkSG, CSDDD).