Senior Java Software Engineer

London (Hybrid – 3 days onsite)

Up to £100,000 Base

A growing financial technology company is looking for a Senior Java Software Engineer to join its backend engineering team.

This is a highly technical role focused on building and optimizing high-performance, low-latency distributed systems. You’ll be joining a strong team of engineers in a business that values deep technical expertise and clean architectural thinking.

The Role

You will join a small but highly capable engineering function and quickly become one of the most senior Java specialists in the business.

The position starts as a hands-on senior individual contributor role, with scope to take on technical leadership responsibility soon after.

Key Responsibilities

• Design and build high-performance applications using Java 25
• Develop and maintain microservices-based architectures
• Solve complex concurrency and multithreading problems
• Work on low-latency, high-throughput systems
• Build and deploy containerised services using Docker & Kubernetes
• Contribute to infrastructure and cloud-based deployments
• Mentor junior and mid-level engineers
• Raise engineering standards and influence architectural decisions

Essential Experience

• Very strong, in-depth knowledge of Java
• Strong experience building microservices
• Proven experience working on low-latency or high-performance systems
• Deep understanding of concurrency and multithreading
• Experience with Docker and Kubernetes
• Experience working in cloud environments (GCP, AWS, or Azure)
• Strong communication skills and ability to operate in a small, ownership-driven team

Desirable

• Financial services experience
• Experience with Dropwizard or similar lightweight frameworks
• Infrastructure-as-code exposure (e.g. Terraform)
• Front-end exposure (Angular)
• Experience using AI tools to improve development productivity