As a Senior Full-Stack Developer youll play a key role in shaping the future of Business Partner Transparency (BPT) within our osapiens HUB. We provide Supplier intelligence that goes beyond helping businesses ensure compliance with ESG regulations. We enable companies to unify transparency compliance and efficiency across their value chain.

Our osapiens HUB is a modern enterprise-grade development platform that enables businesses to build powerful applications without worrying about infrastructure scaling or failover. Youll help develop and refine this cutting-edge serverless ecosystem while delivering meaningful solutions for international clients. This role is based in Madrid where youll collaborate with a talented forward-thinking team.

We embrace a hybrid work model with 3 days a week in the office ensuring the perfect balance between in-person collaboration and remote flexibility.

Your Responsibilities - Design build and optimize full-stack features using modern back-end technologies ensuring scalability and maintainability. Youll use Node.JS and TypeScript on the backend and React.JS on the frontend.

- Develop and enhance innovative software solutions that automate complex compliance workflows for businesses of all sizes.
- Collaborate closely with product managers designers and engineers in small agile squads (4-6 people) to define refine and implement features.
- Ensure high-quality secure and efficient code through rigorous reviews automated testing and continuous integration/deployment (CI/CD) practices.
- Own the architecture and design of Typescript based solutions optimizing for performance reliability and user experience.
- Contribute to technical strategy and decision-making identifying opportunities for innovation and process improvements.
- Mentor and support junior developers fostering a culture of learning and technical excellence within the team.



Your Experience - Strong experience (ideally 5+ yrs) in full-stack development using Node.JS / TypeScript and React.JS.
- Handson experience leveraging AIguided development practices and collaborating within agentic AIdriven engineering environments.
- Expertise in web services development and integration (REST etc).
- Familiarity with Git for version control and collaboration.
- Strong product mindset you think beyond code considering user experience business impact and scalability.
- Agile experience comfortable working in sprints participating in stand-ups and iterating quickly.
- Excellent communication skills (C1 or equivalent) in English. German and/or Spanish skills are a plus (but not necessary). About osapiens osapiens is one of Europes fastest-growing tech companies with an AI platform for compliance and supplier intelligence that enables companies to manage risk and become more resilient. With osapiens solutions companies can verify their products know their suppliers trace their goods own their footprint and report with confidence all on a single AI platform. Founded in Mannheim in 2018 we built the osapiens HUB. A multi-tenant platform designed to enable cross-company collaboration and AI automation and combines more than 25 solutions into seven product suites. These solutions enable companies to centrally manage and automate their supplier relationships compliance requirements and integral supply chains as well as optimize their maintenance service and distribution processes to improve operational performance and maximize global competitiveness. What started as a single idea has grown into an operating system trusted by more than 2500 customers worldwide winning the German Founders Award in 2022 and reaching unicorn status in January 2026. Headquartered in Mannheim Germany we have offices across Europe and the United States where an international team of 550+ builders is shaping whats next.

📌 Senior Full-Stack Developer (NodeJS/Typescript) (Madrid)
🏢 osapiens
📍 Madrid