Senior Full-Stack Developer (ReactJs / NodeJS / Typescript) | €60K - €80K

Joppy is seeking a Senior Full-Stack Developer for a client company specializing in cloud-based AI and IoT solutions for sustainability and compliance. The role involves full-stack development using Node.js, TypeScript, and React.js in a hybrid work model in Madrid.

• Design, build, and optimize full-stack features using modern back-end technologies, ensuring scalability and maintainability (Node.JS and TypeScript on backend, React.JS on 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.

• Strong experience (ideally 4+ years) in full-stack development using Node.JS / TypeScript and React.JS.
• Experience in startups, SaaS or product companies (MANDATORY).
• Hands-on experience leveraging AI-guided development practices and collaborating within agentic, AI-driven 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.

• A purpose-driven mission tackling complex sustainability challenges while working alongside global industry pioneers at a fast-growing unicorn company.
• Room for creativity through collaborative teamwork and an open communication culture.
• Flexibility and team bonding with our hybrid work options.
• Sustainable mobility options, promoting eco-friendly commuting solutions.
• Fun team events and outings with our global teams.