Jane Street interview practice
Quote bid and ask markets around a hidden five card signed sum.
Five card EV · four reveal rounds · live PnL
Start free practiceNo account. No card. Your first run starts here.
Red cards add face value. Black cards subtract it. Quote a spread no wider than 4 around the five card sum.
Traintheoperationthatcostsyoupointsbeforetheclockexposesitagain.
Preparation guide
Practice in one uninterrupted block and use the same keyboard controls you will use on test day. Speed improves when answer entry becomes automatic.
Review both accuracy and response time. A slow correct answer can still reveal the operation family that will cap your score under a fixed deadline.
Repeat weak families separately, then return to a full mixed benchmark. This keeps technique work distinct from pacing practice.
Answers before signup
The market game deals five signed cards and asks for a tight bid and ask as information is revealed.
It tracks realized maker PnL, quote calibration error, trade count, and timeouts.
The hiring firm does not publish a stable universal cutoff. Use accuracy, pacing, and repeatable improvement rather than an unsupported single threshold.
Yes. The embedded trainer starts immediately and stores completed guest runs in this browser.
Separate calculation errors from slow correct answers, then drill the slowest domain and question shape before repeating a full benchmark.
Yes. Multiple choice drills support number keys and A, S, D, F. Typed drills accept exact decimals and fractions.
Keep question-level timing locally and expose the family slowing you down.