Latency Trading Quant Interview Guide
Latency trading quant interview guide covering latency sources, stale prices, queue priority, data, routing, examples, and execution risk.
Candidates discussing reaction time, stale quotes, routing, and infrastructure.
Latency is delay in seeing or acting
Latency can appear in market data, signal computation, order routing, exchange matching, risk checks, and acknowledgements.
Delay creates stale decisions
A quote or routing decision based on old market data can be adversely selected when the true market has already moved away.
Concrete example
A market maker slow to update after correlated futures move may leave stale offers that informed buyers can lift for edge.
Lower latency is not the whole strategy
Speed can improve queue position and reduce stale fills, but durable edge also needs signal quality, risk control, and infrastructure reliability.
Common mistakes
Candidates often say faster is always better. Latency improvements must be worth their cost and relevant to the strategy horizon.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.