Queue Position Quant Interview Guide
Queue position quant interview guide covering price-time priority, queue ahead, cancellations, trades, latency, examples, and caveats.
Candidates discussing limit order book priority, fills, and cancellations.
Queue position determines priority at a price
At the same price level, earlier orders often receive execution before later orders, so queue position affects passive fill probability.
The queue is dynamic
Trades, cancellations, modifications, hidden liquidity, and venue rules can change effective position before an order fills.
Concrete example
Joining the best bid after a large displayed queue may mean waiting a long time unless cancellations or aggressive sells arrive.
Latency can affect position
A slower order may join behind faster participants after a price change, reducing fill chance or increasing adverse selection.
Common mistakes
Candidates often assume displayed size ahead is fixed. Queue estimates should consider cancellations, hidden liquidity, and event timing.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.