Senior Java Software Engineer

Title: Senior Java Engineer

Industry: Financial Services

B2B Contract | Rate: 268 PLN + per hour

Location: Remote (Warsaw office)

A global investment bank is expanding its FX & Commodities Risk engineering team and is hiring a Senior Java Engineer in Poland to help build a next‑generation risk platform used by trading desks in London, Singapore, and New York.

This is a rare opportunity to work on a brand‑new system rewrite while learning from a complex, high‑performance legacy platform that has powered global trading for years.

What We’re Looking For

• Strong experience with Core Java and Spring
• Solid understanding of multithreading, concurrency, and low‑latency systems
• Experience with Kafka, Hazelcast, or similar distributed technologies
• Familiarity with modern data stores (ClickHouse is a plus)
• Ability to learn from and navigate complex legacy systems
• Proactive mindset — someone who can drive development forward
• Strong communication and collaboration skills
• FX Risk or broader trading‑systems experience is a strong plus

About the Platform

The FX & Commodities Risk Platform provides real‑time risk calculations and reporting across multiple asset classes. The current system includes:

• Backend: Java (Core Java, Spring)
• Quant Library: In‑house, with Haskell used for interaction

A full rewrite is underway, moving the platform to a modern, scalable architecture.

What You’ll Work On

You’ll play a key role in building the new platform, which is moving towards:

• Spring Boot
• Kafka for event streaming
• Hazelcast for distributed caching and computing
• ClickHouse for high‑performance data storage and reporting

Key Engineering Focus Areas

• High‑performance multithreading & concurrency
• Low‑latency backend development
• Distributed systems using Kafka and Hazelcast
• Data‑intensive workloads using ClickHouse
• Interacting with the quant library (light Haskell exposure)
• Learning from the legacy system’s memory‑optimised design (critical for JVM stability)

This is a backend‑heavy role with deep engineering challenges.