The 60/40 coin and how much of your bankroll to bet
7 min read Why the biased-coin bet-sizing question turns on maximizing growth rate rather than expected value, and how to answer it under pressure. Read article
Quant Finance
Quant Finance
How Susquehanna interviews traders, and why poker is the point
7 min read SIG’s trader loop runs on the SQE online test, expected-value brainteasers, a live market-making game, and a poker round that tests bet sizing and composure more than card skill. Read article
Quant Finance
The probability brainteasers trading desks still ask
6 min read The reroll game, HH versus HT waiting times, the coupon collector, Bayes, and making a market, with the reasoning trading firms actually grade. Read article
Quant Finance
What a market-making interview actually looks like
6 min read A walk through the mock-market rounds, expected-value bets, and mental-math screens that firms like Optiver, SIG, and Jane Street use to hire traders. Read article
Quant Finance
A quant probability cheat sheet that holds up live
6 min read The probability facts and reasoning patterns that come up most in trading interviews, and the setups that trip people up. Read article
