E-Frontiers – We help top tech talent find opportunities in leading product and scale‑up companies across Europe. We make sure candidates have a great experience and get the information they need to make the best career decisions.

We are currently working with a fast‑growing international fintech, seeking a Senior Backend Engineer to join their core systems team. This is a key role where you’ll work on the platform’s multi‑currency accounting and FX systems – the backbone of the product.

What you’ll do:

- Develop and maintain scalable, reliable backend systems that power key financial operations.
- Design new services and improve existing ones, tackling both microservices and legacy code.
- Collaborate with product and engineering teams to deliver initiatives end-to-end.
- Mentor colleagues and contribute to the overall technical growth of the team.
- Take full ownership of the services you build,



from development to maintenance.

What they offer:

- Competitive salary and performance-based bonus
- Private health insurance
- Budget for training and certifications
- Open‑source‑friendly culture
- Hybrid model: 4 days in the office, 1 remote

Your profile:

- Strong experience building complex backend systems (Python preferred, other OOP languages also welcome)
- Experience in fintech, banking, or regulated environments is highly valued
- Comfortable working with legacy code and improving it over time
- Strong knowledge of APIs, integration, monitoring, and alerting
- Excellent communication skills in English (international team)
- Ownership mindset and responsibility over production systems

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📌 Senior Backend Engineer (Python or OOP) - E-Frontiers (Madrid)
🏢 E-Frontiers
📍 Madrid