Table of Contents
Quant developers are the engineers who build and maintain trading systems. They're not researchers. They're not traders. They're systems engineers who understand finance. And they're incredibly hard to find. Here's how to hire them.
Where to Find Quant Developers
- ✦ Prop trading firms (Jane Street, Optiver, IMC, DRW)
- ✦ Hedge funds (Citadel, Two Sigma, Millennium)
- ✦ Investment banks (Goldman Sachs, Morgan Stanley - HFT desks)
- ✦ HFT exchanges and market makers
- ✦ Open source contributors to trading-related projects
What to Look For
Technical skills:
- ✦ C++ or Rust (or both) for low-latency systems
- ✦ Understanding of exchange connectivity (FIX, WebSocket, multicast)
- ✦ Linux systems programming (kernel bypass, DPDK, io_uring)
- ✦ Network programming (TCP, UDP, multicast, PTP timing)
- ✦ Concurrency (lock-free data structures, atomics, memory ordering)
- ✦ Python for research tools and data analysis
Experience Validation Checklist
- ✦ Built production trading systems
- ✦ Worked with live market data
- ✦ Performance optimization examples
- ✦ Experience handling operational incidents
- ✦ Knowledge of exchange connectivity
- ✦ Experience with monitoring and observability
Interview Questions
Ring buffer, lock-free queue, memory-mapped files, kernel bypass, multi-threaded processing with affinity, protocol parsing optimization.
Spinlock: busy-waits, no context switch (low latency, high CPU). Mutex: sleeps, context switch (higher latency, lower CPU). Use spinlock for very short critical sections.
TSC for nanosecond timing, flame graphs, P99/P999 latency. Reduce: avoid system calls, batch operations, use kernel bypass, lock-free data structures.
Red Flags
Walk away if they:
- ✦ Have no experience with low-latency systems
- ✦ Can't explain the difference between exchange feeds
- ✦ No understanding of FIX protocol
- ✦ Never used perf or other profiling tools
- ✦ Think 'low-latency' means sub-10ms
Evidence Of Genuine Expertise
- ✦ Can discuss latency measurements in detail
- ✦ Understands networking bottlenecks
- ✦ Explains architecture tradeoffs clearly
- ✦ Has production deployment experience
- ✦ Can discuss failure scenarios
- ✦ Has worked with real market infrastructure
Hire Quant Developers Who Ship
Quant developers are specialized. Offline Pixel pre-vets quant developers who have built production trading systems. Raise a request, talk to candidates, fund the project, and approve payment when the work is done.
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