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.