At Experis, a ManpowerGroup company, we specialise in recruiting the best tech talent and matching them with all kinds of organisations, from large corporations to start-ups. We are a company specialising in IT consultancy and the recruitment of professionals in the technology sector across our three practice areas: Business Transformation, Cloud & Infrastructure, and Enterprise Applications. We have a workforce of over 1,800 IT specialists in Spain and an international presence in 54 countries.

If you're a technology professional, we'd love to help you find that new opportunity you're looking for - the one that will help you take the next step in your career. We are a lean team of senior full-stack engineers, and this role sits at the top of that group as the person we rely on when something is hard, ambiguous, or nobody else has the context. This is a hands-on role, roughly 90% coding.

What you will own End-to-end feature delivery across the whole stack: Next.js frontend, Node.js backend, PostgreSQL, and deployment. Our real-time analytics dashboard, which gives merchants a single view of ad performance across every channel and platform.

Our UI component library:



long-term ownership of how we build and maintain frontend consistency across the product.

Infrastructure and reliability: database optimisation, Redis stability, observability, and integrations with ad platforms including Meta, Google, Bing, and Taboola. Keeping the product's data layer fast and reliable as we grow: schema and query performance, sensible aggregation, and reporting that holds up under load.

Strong TypeScript on both sides: React/Next.js on the frontend and Node.js on the backend.

Solid PostgreSQL: schema design, query optimisation, and migrations, with the instinct to reason about performance under high write volume. A genuine end-to-end ownership mentality, from technical design through implementation to deployment, and the pragmatism to ship a good solution rather than chase a perfect one. Comfortable using AI tools such as Claude as part of your daily workflow to increase speed and quality.

GraphQL. Fastify or similar Node.js frameworks. Redis. DigitalOcean App Platform or Vercel. Full-time remote with versátil hours (CET timezone overlap required)

📌 Principal FullStack Engineer (Madrid)
🏢 Experis España
📍 Madrid