Trader Quant Interview Questions

740 trader quant interview questions shared by candidates

You are given three envelopes, one of which contains $100 and the others contain nothing. You randomly pick one envelope but don’t open it. The interviewer then opens one of the other two envelopes and shows that it’s empty. Now you have a choice: stick with your original envelope or switch to the other unopened envelope. What should you do to maximize your chances of winning, and why?
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Quant Trader Intern

Interviewed at Jane Street

4.4
Oct 17, 2024

You are given three envelopes, one of which contains $100 and the others contain nothing. You randomly pick one envelope but don’t open it. The interviewer then opens one of the other two envelopes and shows that it’s empty. Now you have a choice: stick with your original envelope or switch to the other unopened envelope. What should you do to maximize your chances of winning, and why?

About myself, asked about a project on my CV. Standard stats questions, expected them to be hard, they were medium difficulty for first round however actually doing them out loud and explaining thought process was nerve racking and hard to focus.
avatar

Quant Trader Intern

Interviewed at Jane Street

4.4
Nov 11, 2025

About myself, asked about a project on my CV. Standard stats questions, expected them to be hard, they were medium difficulty for first round however actually doing them out loud and explaining thought process was nerve racking and hard to focus.

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