Software Engineer - Low Latency / Distributed Systems
Tier-1 Investment Bank, Dublin (Hybrid) - Contract
Leading investment bank's Dublin technology hub is expanding its high-frequency trading infrastructure team. This is deep, hard engineering - the systems you build execute trades in microseconds, and every millisecond you shave off is measurable P&L. Not a CRUD shop, not a maintenance role.
What you'll work on:
- Low-latency, high-throughput distributed systems processing millions of market events per second
- Performance-critical execution paths in C++/Java/Rust - kernel bypass, lock-free data structures, zero-copy design
- Market data ingestion, order routing, and risk systems operating at exchange speed
- Direct collaboration with quant developers and trading desks
- Profiling and tuning at the OS/network/hardware boundary - NUMA awareness, CPU pinning, kernel bypass networking (DPDK/Solarflare-style stacks)
What we're looking for:
- Strong CS fundamentals - concurrency, memory management, networking internals, cache-aware design
- Production experience in C++, Java, or Rust in a genuinely performance-sensitive environment
- Exposure to FIX protocol, market data feeds, or exchange connectivity is a strong plus
- Comfortable working close to the metal - this isn't abstraction-layer engineering
- Fintech/trading background not mandatory - elite backend engineers from adjacent high-scale, low-latency domains (ad-tech real-time bidding, gaming infra, telco) will be seriously considered
Team & setup:
- Small, senior engineering pod embedded within the trading technology group
- Hybrid - Dublin office, with onsite time expected around trading hours/desk collaboration
- Contract engagement, initial term with strong likelihood of extension given desk growth plans
GCS is acting as an Employment Business in relation to this vacancy.
Senior Software Engineer
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