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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:

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- 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.



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- Take full ownership of the services you build, from development to maintenance.

What they offer:

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- 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:

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- 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) (Madrid)
🏢 E-Frontiers
📍 Madrid