Tier 1 Hedge Fund
HQ: Miami, FL (formerly Chicago)
Citadel (Hedge Fund) and Citadel Securities (Market Maker) are the largest players in the game. Known for Ken Griffin's drive, extraordinary talent, and intense competition.
At a Glance
Compensation
Intern: $20k/month + Housing
New Grad: $300k - $500k TC
Interviews
Focus: C++ (System Design), Python (Data), Probability (Bayes).
Tech Stack
Core: Modern C++, Python, FPGA.
Style: Pragmatic C++. Performance is paramount.
The Interview Process
- Online Assessment (OA): Often HackerRank or CodeSignal. Expect Hard LeetCode (Graph, DP) and probability questions.
- Phone Screen: Technical.
- Quant Dev: Multithreading, memory management, lock-free queues.
- Quant Research: Probability theory, covariance matrices, OLS assumptions.
- Onsite (Superday): 3-4 Rounds.
Expect behavioral questions testing drive and ambition. "Tell me about a time you failed." "Why Citadel? Why not Jane Street?"
Sample Questions
Coding: The Order Book
Design a Limit Order Book structure that supports add, cancel, and execute operations in O(1) or O(log N).
Bonus: How do you make it thread-safe without locks?
Probability: The Breaking Stick
You break a stick into 3 pieces at 2 random points.
What is the probability that the 3 pieces can form a triangle?
Culture & Perks
- Meritocracy: The best idea wins, regardless of seniority.
- Intensity: Long hours are common, but the work is impactful immediately.
- Resources: The best data, the fastest servers, and unlimited budget for tools.
- Events: Famous annual parties featuring artists like Carly Rae Jepsen or Calvin Harris.