NUMBERO , a leading German tech startup revolutionizing after-sales processes in car dealerships, is looking for a Full Stack Engineer (m/f/d) to join our growing development hub in Valencia. WHO WE ARE At NUMBERO, our mission is to equip car dealerships with cutting-edge tools to optimize their after-sales operations. We integrate trusted sources for parts and labor costs, various Dealer Management Systems, and other relevant data sources. Headquartered in Germany and supported by a growing international team, we focus on innovation, collaboration, and delivering outstanding value to our clients.
Our Valencia office plays a key role in shaping the future of our technologies and services. ABOUT THE ROLE We are looking for a versatile Full Stack Engineer with strong backend and data engineering skills. You will work across a Node.js backend, React and Type Script frontend, and data platforms such as Databricks, supporting data pipelines, integrations, analytics, and AI-driven features. The role requires end-to-end ownership, from database and API design through frontend delivery, deployment,



and monitoring.
You should be comfortable working across application development, data workflows, job queues, migrations, authentication, and production systems. Develop and maintain web application features across the full stack (React + Type Script frontend, Express.js + Type Script backend)
Design and implement database schemas, migrations, and optimized queries (My SQL / Maria DB)
Build and maintain REST APIs and integrate them with frontend systems
Integrate web applications with data platforms (Power BI, Databricks, Azure Data Lake Storage)
Maintain high test coverage and participate in code reviews
Collaborate with technical and business stakeholders REQUIRED TECHNICAL SKILLS Frontend & Web
Strong expertise in React + Type Script
Advanced HTML5 / CSS3 (Bootstrap, Tailwind CSS)
Git version control Backend & Infrastructure
Solid experience with Node.js + Express.js
My SQL /

📌 Full Stack Engineer (Madrid)
🏢 Numbero Spain
📍 Madrid