Built by someone who does this for a living.

Quant Ladder exists because the standard advice for quant interview preparation is a reading list, and reading lists don't build the two things these interviews actually test: speed under pressure and calibrated intuition.

I've prepared for these interviews as a candidate, passed them, worked in the seat, and later sat on the other side of the table giving them. The pattern was always the same: the candidates who got offers weren't the ones who had read the most — they were the ones who had practiced in the real format, daily, for weeks. Timed arithmetic until 17 × 23 was reflex. Expected-value problems until setting up the calculation was automatic. Market-making games until managing inventory felt like balance, not bookkeeping.

So that's what this product is: the practice loop I wish had existed, with none of the padding. Every question is written by hand with a worked solution that would survive a follow-up from a real interviewer. The difficulty ratings are calibrated, not guessed. The mental-math trainer matches the actual screens firms use. The simulator scores the things trading desks actually care about — spread capture, inventory discipline, and how you react when flow turns toxic.

It's a small product, deliberately. One founder, no growth team, no engagement tricks beyond a streak counter. If it stops being the most efficient way to prepare, I'd rather fix that than market around it.

Questions, corrections, or a problem you think deserves a better solution? Get in touch — I read everything.