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.

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.

What you'll do

- 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

What you bring

- 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; German or Spanish is a plus
- Legal existing right to work in Spain: EU citizenship or an alternative granting a right to work in Spain ( visa sponsorship is not available)

What's offered

- 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

Hiring process after the pre-vetting

1. HackerRank challenge (about 1–1.5 hours, one sitting)
2. 60-minute technical interview with a Team Lead and Senior Developer
3. Final on-site interview in Madrid

📌 Senior Full-Stack Developer (Node.js / React), hybrid in Madrid (relocation)
🏢 lemon.io
📍 Madrid