Research topic

Interviews: what the evidence actually shows

Every published piece filed under interviews. Written for people working in, moving into or hiring across quant firms, and readable without applying for anything.

Pieces
2
Most recent
26 Oct 2026
Topics
7

Citadel Interview Questions: What the Firm Actually Tests Across QR, Dev and Trading

26 Oct 2026 · 6 min read

A breakdown of Citadel and Citadel Securities interview questions across quantitative research, software engineering, and trading, covering loop structures and preparation strategy.

  • Key takeaways: Citadel and Citadel Securities run separate interview loops tailored to hedge fund portfolio strategies and market-making latency constraints respectively.
  • What questions does Citadel ask software engineering candidates?: Citadel software engineering questions assess low-level systems fundamentals, algorithmic efficiency, and object-oriented design in modern C++ or Python.

Quant interview preparation: what firms really test

19 Jan 2026 · 1 min read

The question families that appear again and again, how they differ by seat, and a preparation plan that does not waste months on the wrong material.

  • They are scoring the reasoning, not the answer: The single most common mistake is silence.
  • A preparation plan: Work in the order of the seat you want.