full-stack developer for supplier intelligence

Lemon.io is hiring on behalf of a fast-growing SaaS company that helps around 2,500 businesses in 50+ countries bring transparency, compliance, and efficiency to their supply chains. This is an in-house, direct-hire role suggesting relocation to Madrid. As a Senior Full-Stack Developer you'll shape a supplier intelligence product inside the company's enterprise-grade, serverless development platform. You'll build features that automate complex compliance and ESG workflows for international clients, working in a small agile squad of 4–6 people.

• Design, build and optimize full-stack features with Node.js and TypeScript on the backend and React on the frontend
• Own the architecture and design of TypeScript-based solutions, optimizing for performance, reliability and UX
• Work closely with product managers, designers and engineers to define and ship features
• Keep quality high through code reviews, automated testing and CI/CD
• Contribute to technical strategy and mentor junior developers

• 5+ years of full-stack development with Node.js / TypeScript and React
• Hands-on experience with AI-assisted development and agentic, AI-driven engineering workflows
• Strong web services / REST integration experience and Git
• A product mindset — you think about user experience, business impact and scalability
• Comfort with agile sprints and fast iteration
• English at C1 level
• Legal existing right to work in Spain: EU citizenship or an alternative granting a right to work in Spain (visa sponsorship is not available)
• Будет плюсом: German or Spanish is a plus

• Full-time contract, hybrid in Madrid (3 days/week in the office)
• Competitive salary plus monthly benefits
• Relocation bonus for candidates open to moving to Madrid