Java Low Latency Connectivity Engineer

London

1 month ago

Applications closed

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Java Developer

Java Developer – Low Latency Crypto

Java Low Latency Connectivity Developer

London | 4 Days Office, Victoria | Crytpo Exchange Connectivity / FIX

A specialist electronic trading firm is seeking a Java Low Latency Connectivity Developer to join a highly technical, performance-driven engineering team.

The business operates automated trading strategies across both traditional financial markets and crypto venues. Technology is central to performance, and connectivity to exchanges is a core competitive edge.

This is a hands-on role within a small, experienced team where engineers work directly on systems that impact live trading outcomes.

The Role

You will be responsible for designing, building and optimising exchange connectivity across multiple venues, with a strong focus on crypto markets.

Key responsibilities include:

Developing ultra-low latency Java components
Managing FIX protocol sessions and order flow
Integrating and optimising crypto exchange APIs using REST and WebSocket
Handling real-time JSON market data feeds
Improving performance and reducing latency across exchange connections
Supporting and enhancing live trading systems

Each exchange has its own architecture, API behaviour and performance characteristics. You will play a key role in ensuring reliable, high-performance connectivity across them.

What We Are Looking For
Strong core Java expertise
Experience in low latency or performance-critical systems
Solid understanding of FIX protocol (session and application layers)
Direct experience connecting to trading venues or exchanges
Hands-on experience integrating with crypto exchanges
Strong understanding of REST and WebSocket APIs in real-time environments
Experience working in Linux-based production systems

Exposure to high-performance libraries such as Aeron, Agrona, SBE or Artio is advantageous.

The Environment
Small, collaborative engineering team
Flat structure with real ownership
Office-based in Victoria, London (4 days per week)
24/7 automated trading systems
Occasional out-of-hours support rotation

This role is well suited to engineers who enjoy working close to the market, solving hard performance problems, and taking responsibility for exchange connectivity in a fast-moving environment

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