We’re hiring 4 Backend Engineers (Mid, Senior, and Staff levels) to join a high-impact API Platform team building scalable, self-serve infrastructure used by both customers and internal product teams.

This is a rare opportunity to join a fast-growing fintech environment where the API is a top business priority and sits at the core of the company’s platform modernisation strategy.

? Location
Madrid (Hybrid: 4 days in office / 1 day remote)

? Salary
€40K – €90K + bonus + benefits (depending on experience level: Mid / Senior / Staff)

? About the team
You’ll join an API Platform team focused on:
- Building a modern, scalable API surface used by external clients and internal teams
- Creating self-service capabilities, including instant API credential provisioning
- Launching and expanding a new API sandbox environment for clients
- Improving performance, observability, reliability, and developer experience
- Building foundations for AI-driven workflows via API integrations (MCP / agentic interfaces)
- Supporting platform modernization and service decomposition at scale





The API is evolving into a product in itself, with strong visibility across engineering and the business.

?️ Tech environment
You don’t need to know everything, but experience in similar ecosystems is key:
- Backend: Python, Django, REST APIs
- Data: PostgreSQL, Redis
- Infrastructure: AWS, Docker, Kubernetes, Terraform
- Identity / access: IAM concepts (Keycloak or similar is a plus)
- Strong engineering fundamentals: system design, OOP + functional design, clean architecture
- CI/CD, observability, monitoring, and production ownership mindset

? What you’ll do
Depending on your level, you will:
- Design and build scalable backend services and APIs
- Own services end-to-end (“you build it, you run it”)
- Contribute to architecture decisions via RFC process
- Improve platform reliability, latency, and developer experience
- Mentor more junior engineers (Senior+ levels)
- Help shape a modern platform

📌 Backend / API Engineers (Mid to Staff level) – Fintech Platform (Madrid / Hybrid)
🏢 E-Frontiers
📍 Madrid