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 general scale

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