Summary: As a Senior Full-Stack Developer, you will shape Business Partner Transparency products within a modern, enterprise-grade development platform. Highlights: 1. Design, build, and optimize full-stack features using modern technologies 2. Collaborate in small, agile squads to define and implement features 3. Contribute to technical strategy 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 products (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, a vibrant tech hub at the heart of Madrid center, 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.** ### **Key Responsibilities** * Design, build, and optimize full\-stack features using modern front\-end and back\-end technologies, ensuring scalability and maintainability. * 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. ### **Skills, Knowledge and Expertise** * Strong experience in full\-stack development with a focus on Node.js (Mainly) and Typescript. ReactJS, JavaScript is also good to bring. * 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\). German is a bonus (B1\+) ### **Benefits** * An Unicorn with purpose\-driven mission with and for global industry pioneers in tackling complex challenges * Room for creativity through collaborative teamwork and an open communication culture * Flexibility and team bonding with our hybrid work options * Fuel for your growth journey, both personally and professionally * Sustainable mobility options, promoting eco\-friendly commuting solutions * Fun team events and outings with our global teams * Inspiring workspaces in Madrid * 25 days vacations * Health Care Insurance ### **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.