Senior Full-Stack Developer (React / Node.js) (m/f/x)
Department: Business Partner Transparency
Employment Type: Permanent - Full Time
Location: Madrid
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.
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 React.js, Node.js, JavaScript, and TypeScript.
* 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.
Benefits
* A 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 and beyond
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