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 used at integral scale
What we're looking for
Stron

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