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Interview questions from top companies, mapped to the exact round they show up in. Prep for what you will actually face.

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The Loop aggregates publicly shared interview experiences and curated commonly-asked questions, each labeled with its source. Not affiliated with any company listed.

CC BY-NC 4.0 · © 2026

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J

Trading · New York, NY

Jane Street

Quant trading in OCaml. Probability, mental math, and deep problem-solving.

5 interviews shared — read how each round went.

5 of 5 shown

Role
Level
Full-stackNew Grad / JuniorRejected

New Grad / Junior · Full-stack

Junior fullstack interview. Fundamentals mattered as much as getting to an answer.

5 rounds · 11 questions · 2024→
BackendSeniorOutcome unknown

Senior · Backend

A senior backend loop. Balanced across coding, design, and collaboration.

6 rounds · 13 questions · 2023→
FrontendSeniorRejected

Senior · Frontend

6-round senior frontend process. Fundamentals mattered as much as getting to an answer.

6 rounds · 13 questions · 2025→
Full-stackSeniorNo offer

Senior · Full-stack

A senior fullstack loop. Coding-heavy early, design and behavioral later.

6 rounds · 13 questions · 2024→
BackendStaff+Withdrew

Staff+ · Backend

Staff backend interview. Fundamentals mattered as much as getting to an answer.

5 rounds · 9 questions · 2023→