Citadel coding interview questions
30 problems, in the order the guide teaches them. Each lesson gives the full problem, a worked solution and the follow-ups interviewers tend to add.
Citadel system design interview questions
5 designs, each worked end to end in its own lesson, from requirements to the architecture and its trade-offs.
| # | Question |
|---|---|
| 1 | Design a Matching EngineFree |
| 2 | Design a Market Data Feed Handler (Premium) |
| 3 | Design a Low-Latency Order Gateway (Premium) |
| 4 | Design a Time-Series Tick Store (Premium) |
| 5 | Design a Backtesting System (Premium) |
A lock means the design is named here and its walkthrough is Premium.
Citadel behavioral interview questions
15 questions, grouped by what the interviewer is testing. The lesson explains why each one gets asked and what a strong answer covers.
Why Citadel, and why this path (3)
Drive and ownership (3)
Pressure, resilience, and a real miss (3)
Collaboration and productive debate (3)
Intellectual honesty and curiosity (3)
See all 50 Citadel questions by name
Premium opens the 43 locked questions on this page, each with the full prompt and a worked answer, and every other lesson in all 100 company guides.