Summary: As a Senior Full-Stack Developer, you will shape the future of Business Partner Transparency within a modern, enterprise-grade serverless ecosystem. Highlights: 1. Develop and refine a cutting-edge serverless ecosystem for international clients 2. Collaborate in small, agile squads to define, refine, and implement features 3. Contribute to technical strategy, innovation, and mentor junior developers ### **Description** As a Senior Full\-Stack Developer, you’ll play a key role in shaping the future of Business Partner Transparency (BPT) within our osapiens HUB. This enterprise\-grade platform helps companies comply with critical ESG regulations like:* The German Supply Chain Due Diligence Act (LkSG) – ensuring suppliers uphold human rights and environmental standards. * The Whistleblower Directive – providing secure, anonymous reporting channels. * The Corporate Sustainability Due Diligence Directive (CSDDD) – upcoming EU\-wide sustainability compliance. Our osapiens HUB is a modern, enterprise\-grade development platform that enables businesses to build powerful applications without worrying about infrastructure, scaling, or failover. You’ll help develop and refine this cutting\-edge, serverless ecosystem while delivering meaningful solutions for international clients. This role is based in Madrid, where you'll collaborate with a talented, forward\-thinking team. **We embrace a hybrid work model, with three 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.\- Front End experience is good to have. * 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 (5\-7 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 JavaScript\-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 (6\+ yrs) in full\-stack development with a focus on Backend (Node.JS and TypeScript) React.JS is desirable * Expertise in web services development and integration (REST, GraphQL, 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 in English (C1\). Spanish is a bonus but not necessary. ### **About osapiens** **osapiens** develops holistic Software\-as\-a\-Service solutions that help global companies ensure transparency, efficiency, and trust across their entire value chain. Through its cloud platform, the **osapiens HUB**, the company leverages innovative technologies, including artificial intelligence, to strengthen businesses while promoting human rights, ecological responsibility, and sustainable corporate governance. Founded in 2018 and headquartered in Mannheim, Germany, **osapiens** works with **around 2,000 companies in over 50 countries** across industries such as consumer goods, automotive, fashion, pharmaceuticals, and medical products. The company is backed by **Goldman Sachs** and **Decarbonization Partners**, reinforcing its commitment to responsible, sustainable growth.