Backend Engineer – Functional Programming

A high-growth fintech scale-up that tackles complex e-commerce challenges is expanding its R&D hub in Lisbon and is looking for several Backend Engineers (junior & mid-level). You’ll join a cloud-native, microservices-driven environment where developers own features end-to-end—from shaping requirements to deploying and monitoring production code.

Key Responsibilities:

• Design and build scalable microservices that process high-volume, real-time traffic.

• Write clean, idiomatic Scala / Java / Kotlin with a strong functional-programming mindset.

• Deploy, observe, and optimise containerised workloads on Docker + Kubernetes across public clouds.

• Collaborate with Product, Data Science, and DevOps to deliver new fraud-detection and payment-risk capabilities.

• Contribute to architecture and code reviews, championing best practices in testing and CI/CD.

This is a Full time, Hybrid position. Working 3 days a week from the office in Central Lisbon.

Why Should You Apply?

• Impact: Ship revenue-critical services used by global brands.

• Modern Stack: Scala, Kafka, Kubernetes, Spark and more

• Ownership Culture: “Get your stuff done” ethos—focus on outcomes, not clock-watching.

• Hybrid Flexibility: 2 days/week in the Lisbon office (moving to 3), core hours ~10:00–18:00.

• Competitive Package:

◦ Junior: €58-60 k base + 6 % annual bonus

◦ Mid: €65 k base + 6 % annual bonus

◦ Health, dental, wellness, WFH, meal allowances, generous PTO (exact amounts finalised at offer).

Applicants must already hold EU work authorisation. Our client cannot sponsor visas or relocation for this role.

Mandatory Requirements:

• 1-2 years (Junior) / 3-4 years (Mid) of hands-on server-side development.

• Proven experience in functional programming principles (pure functions, immutability, FP libraries).

• Production work with at least one major cloud provider (AWS, GCP, Azure) and container tech (Docker & Kubernetes).

• Solid understanding of microservice fundamentals and REST / event-driven communication.

Nice to Have:

• Experience designing microservice architectures at scale.

• Familiarity with data-modelling for SQL or NoSQL stores.

• Exposure to high-throughput streaming (Kafka, Kinesis).