Senior Java Software Engineer

RE Partners

London, UK

9 days ago

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Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Experience level

Expert

Experience required

8 years minimum

Working hours

Regular working hours

Job source

www.collegerecruiter.com

Tech stack

Java (Programming Language) Amazon Web Services Cloud Engineering Software Quality Software Debugging Distributed Systems Financial Information EXchange Performance Tuning Multithreading Concurrency Spring-boot Kubernetes

+3 more

Apache Kafka Crud Microservices

Job description

We are looking for a Senior Java Engineer to join a small, elite team working on a high-impact payments platform for a top-tier investment bank. This is not a generic CRUD role. You’ll be building and optimising systems that process millions of transactions per second - low-latency, high-throughput, mission-critical. The team is senior, empowered, and takes full ownership of services from design to production support. If you’re a hands-on Java engineer who enjoys solving complex performance problems, debugging threading issues, and working with modern tech, this could be the right move for you., * Design, build, and optimise low-latency, high-throughput microservices using Java 21, Spring Boot, Kafka, and Kubernetes

Own services end-to-end - from architecture and implementation to deployment and production support
Work on concurrency, multithreading, and performance tuning - solving real production problems
Collaborate with a small, senior team - no hand-holding, real ownership
Drive code quality, engineering standards, and best practices across a wider organisation

Requirements

Must-Have:

8+ years of hands-on Java development experience
Strong experience with multithreading and concurrency in production
Experience with Kafka (or similar messaging systems)
Good understanding of distributed systems and cloud-native architectures
UK work authorisation (no visa sponsorship available)

Nice to Have

Experience in banking, financial services, or payments
Experience with Kubernetes and AWS
Knowledge of FIX protocol or electronic trading systems
Experience with performance tuning and optimisation

About the company

Why Join?

Meaningful Work: You’ll be building systems that power global payments - your code will have real impact
Modern Tech Stack: Java 21, virtual threads, Kafka, Kubernetes, AWS - no legacy maintenance
Senior Team: Work alongside engineers with elite banking and tech backgrounds
Real Ownership: You’ll own services from design to production - not just tickets
Long-Term Stability: This is a permanent role - we’ve had people on this project for over 3 years