The private training ground for quant interviews
Where tradersare made.
1038 problems with full workings. Three live markets to quote. Six timed screens in the formats the firms actually use. And a grading engine that scores your decisions, never your luck.
1038 problems · 3 games · 6 screens · 17 firms, 138 problems free, no signup
Know the room
Prep for your firm
Seventeen firms, seventeen interview personalities. Each guide maps what candidates report to the exact questions, screens, and games that train it.
Jane Street
Probability, betting games, and reasoning out loud.
Read the guide →Optiver
The famous arithmetic screen, then market-making games.
Read the guide →SIG
Decision-making under uncertainty, with a poker culture.
Read the guide →Citadel Securities
Sharper math, stochastic processes, and markets fluency.
Read the guide →IMC
Pattern screens, dice games, and trading simulations.
Read the guide →Akuna Capital
Options from day one.
Read the guide →Three rooms, one house
Choose your door
Room I
The Collection
PROBABILITY 60
EXPECTED VALUE 42
MARKET MAKING · OPTIONS ∗
MACHINE LEARNING 38
+ SIX MORE WINGS 1038 total
Every problem with hints that scaffold, a worked proof, the classic traps, and the follow-ups the interviewer is holding back.
Browse →Room II
The Gaming Room
Quote markets against sharps, price hidden cards as they turn, survive the auctions. The die is real, try it. So is the adverse selection.
Take a seat →Room III
The Examination
The final round, simulated: priced bets, a winner's-curse auction, calibration under the clock, every decision graded against the optimal play, sealed with the committee's verdict.
Walk in →Tonight at the desk
“Put-Call Parity”
one problem · every day · same for everyone · streaks kept
The standard
Solutions written like a mentor, not a textbook.
The fast structural argument an interviewer wants to hear. The careful derivation that proves it. The trap most candidates fall into, named. And then the follow-ups, because at a trading firm a correct answer is where the conversation starts.
- ◆ Progressive hints, scaffold, never spoil
- ◆ Multiple approaches where they exist
- ◆ Interviewer follow-ups, with answers
- ◆ Tagged by firm, topic, difficulty
Each day the market is either calm or volatile. A calm day is followed by a volatile day with probability ; a volatile day is followed by a calm day with probability . Over a very long horizon, what fraction of days are volatile?
From the solution
“In steady state, the flow of probability from calm into volatile must equal the flow back, otherwise the occupancy of one state would drift.”
Membership
Free to enter. Private to master.
House
$0
138 full problems with their solutions, the daily ritual, spaced review, every study track. A real taste, forever.
Private
$39 / month
Every medium and hard problem with its proof, the Gaming Room, all timed screens, the Examination with its verdicts, mock loops, and everything we add next, included.
The offer goes to whoever
did the reps.