Java Software Engineer

Company: Harrington Starr
Apply for the Java Software Engineer
Location: London
Job Description:

Java Engineer – Institutional Trading | London | Hybrid

I’m working with a leading global fintech that is expanding its institutional trading technology team and looking for a Java Engineer to help build a new generation of high-performance trading APIs.

You’ll join a team responsible for connectivity between institutional clients and global markets, working on systems where performance, reliability and resilience genuinely matter.

What you’ll be working on:

  • Building and developing trading APIs used by institutional clients
  • Working with asynchronous, event-driven and messaging systems
  • Building resilient external APIs and integrations
  • Improving performance, reliability and automation across the platform
  • Working closely with product and business stakeholders
  • Cloud-based development, predominantly AWS

What we’re looking for:

  • Around 5+ years of Java development experience
  • Strong Java and Spring/Spring Boot
  • Multithreading and concurrency experience
  • Experience with asynchronous systems, messaging or streaming
  • Experience building external APIs
  • AWS or other cloud experience
  • Financial markets/trading experience is highly advantageous

Location:

London – hybrid, 3 days per week onsite

Strong opportunity for a Java engineer looking to move closer to institutional trading and work on performance-sensitive systems used directly by financial markets clients.

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Posted: September 20th, 2026