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Senior Full-Stack Developer (React / Node.js) (m/f/x) Job Opening In madrid – Now Hiring osapiens

Senior Full Stack Developer (React / Node.js) (m/f/x)

    Spain Jobs Expertini Expertini Spain Jobs Madrid Other General Senior Full Stack Developer (React / Node.js) (M/f/x)

Job description

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
#J-18808-Ljbffr

Required Skill Profession

Other General


  • Job Details

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