Quant Interview Systems Final Drill
Final trading systems drill for quant developer interviews covering market data, order state, latency, risk checks, replay, and observability.
Candidates preparing for quant developer systems and infrastructure interview prompts.
Track data flow end to end
A systems answer should trace market data intake, normalization, strategy logic, order routing, fills, risk checks, storage, and monitoring without losing state transitions.
Make order state explicit
Orders can be new, acknowledged, partially filled, canceled, rejected, or replaced. State machines are useful because silent state assumptions cause production bugs.
Discuss latency as a tradeoff
Low latency matters in some systems, but correctness, risk controls, recovery, and observability still matter. Explain the tradeoff for the system being designed.
Plan replay and recovery
Trading systems need logs, sequence numbers, idempotent handlers, and replay paths. A final drill should include what happens after a disconnect or restart.
Common mistakes
Candidates often describe a happy-path service diagram. Strong systems answers include failure modes, consistency, backpressure, risk checks, and monitoring.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.