Career Notes
From The Woo.
Notes on quant interviews, firms, war stories, and advice. Written under a pseudonym; opinions are personal.
war-stories4 min
Interview war story: the birthday paradox
I once watched a candidate fail the birthday paradox in a final-round Jane Street interview. Don't be that candidate.
The Woo · Jul 2026
advice4 min
Why the green book matters
Xinfeng Zhou's book isn't perfect, but it's the canonical quant interview prep. Here's why.
The Woo · Jul 2026
firms5 min
The Woo on Jane Street interviews
What Jane Street actually asks. Hard math, fast, in person.
The Woo · Jul 2026