Java Low Latency Connectivity Engineer

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.