Java Low Latency Connectivity Engineer

London
3 days ago
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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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