HFT Systems Quant Interview Guide
HFT systems quant interview guide covering market data, order gateways, latency, risk checks, monitoring, and practical design tradeoffs.
Candidates preparing for quant developer, trading systems, or infrastructure-heavy quant interviews.
Start with the system map
An HFT system interview usually expects a map of market data intake, strategy logic, order gateway, risk controls, persistence, and monitoring. Keep the design generic and explain the responsibilities of each component.
Latency is one requirement
Low latency matters, but it is not the only requirement. Correctness, recoverability, data quality, and risk controls can be just as important depending on the component being discussed.
Concrete example
A simple design might consume market data, update an order book, compute a signal, pass pre-trade checks, send an order, then process acknowledgments and fills while logging state transitions.
Risk and observability belong in the design
Mention limits, kill switches, sequence-gap handling, latency metrics, and alerting. Interviewers often reward candidates who think beyond the happy path.
Common mistakes
Candidates often describe a fast strategy without explaining data correctness, order state, or failure handling. A stronger answer separates proprietary strategy from generic systems design.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.