Trading Systems Cycle Review
Trading systems cycle review covering HFT system maps, market data, order gateways, latency, risk controls, replay, reconciliation, and observability.
Candidates consolidating HFT and trading systems interview prep.
Review the system path
Trace the path from market data to internal state, signal, risk check, order gateway, execution report, trade capture, position, and monitoring. Name state owners along the way.
Review failure modes
Be ready to discuss sequence gaps, stale feeds, disconnects, order uncertainty, queue overload, duplicate fills, latency spikes, and reconciliation breaks.
Review risk controls
Pre-trade checks, kill switches, throttles, limits, alerts, and recovery workflows help keep a trading system controlled when assumptions fail.
Concrete final drill
Design a small market-data-to-order system, then walk through what happens when market data gaps, an order reject arrives, and latency p99 doubles.
Common mistakes
Candidates often optimize for speed in isolation. Strong systems answers balance latency, correctness, risk, recovery, and observability.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.