Citadel Securities Interview Questions
& Process
Real candidates share what happened, how many rounds they had,
and how the experience turned out.
Based on 437 interview experiences · FREE TO READ
Which role are you interviewing for?
30 roles · 437 reportsCandidate interview experiences
First-hand accounts from people who interviewed at Citadel Securities.
Citadel Securities
Quantitative Trading Intern
Intern Average Positive experience No offer 6 rounds
Interview process
Take home Phone screen Onsite Group Presentation
Interview formats
Technical Group Presentation
Started with an online assessment, then had two rounds of interviews with traders focusing on general probability and market making games. This was followed by an in-office onsite interview which included a group game and three more interview rounds covering statistics and probability. The game was also similar in concepts. It was a very traditional quant process.
Confirmed questions3 questions
- Questions on probability and statistics
- Questions about market making strategies
- Questions related to quantitative trading
Citadel Securities
Software Engineer
Entry Difficult Positive experience No offer 1 round
Interview process
Technical screen
Interview formats
Coding
The interview process overall was good. I've successfully completed the initial round, which involved a problem-solving question on HackerRank. The task was to optimize given code from O(n^2) to O(n) complexity. The specific problem was related to the 'Best Time to Buy or Sell Stock', a problem I've encountered on LeetCode before. I'm awaiting feedback from the hiring team within a week after submitting my solution.
Confirmed questions1 question
- The overall interview was good. I've just cleared the first round of the interview, which was a problem-solving question on HackerRank to optimize the given code from o(n^2) to o(n). The problem is based on: "Best Time to Buy or Sell Stock" which I already solved in LeetCode. Once I submit it, I will get the feedback from the hiring team in a week.
Citadel Securities
Trading Intern
Intern Average Positive experience No offer 3 rounds
Interview process
Take home Technical screen Technical screen
Interview formats
Technical Coding
It started with an online assessment that had 10 probability questions. These were mostly simple dice and coin flip problems, and I think you had about 25 minutes for it. Then came the first round interview, which covered similar probability questions but specifically about casino games. The second round focused on market making. I'd really practice these because they ask a lot about logic, risk parameters, and how you should bet based on changes in continuous versus stationary distributions.
Confirmed questions1 question
- Could you set up a market for the total of three dice rolls?
Citadel Securities
Quantitative Trader
Mid Difficult Neutral experience No offer 3 rounds
Interview process
Technical screen Recruiter call Onsite
Interview formats
Technical Behavioral Coding Case
The whole process had three stages. First, there was a timed online assessment covering probability, combinatorics, mental math, and estimation. Then, a short recruiter call to check on fit and motivation. Finally, a virtual onsite with several rounds, each lasting 30 to 45 minutes, focusing on market making, risk-reward tradeoffs, brainteasers, data interpretation, and teamwork. They made a decision in about a week.
Confirmed questions3 questions
- Three stages. Timed online assessment on probability, combinatorics, mental math, and estimation.
- Short recruiter call on fit and motivation.
- Virtual onsite with several 30 to 45 minute rounds on market making, risk reward tradeoffs, brainteasers, data interpretation, and teamwork.
Citadel Securities Interview Questions
Quoted word for word from Citadel Securities interview reports.
“What is the probability of getting more than 4 heads when flipping 8 fair coins?”
Read reports →“What is the expected number of dice rolls needed to get two sixes consecutively?”
Read reports →“For n coin tosses, what is the probability that an even number of heads appears?”
Read reports →“What's the probability that everyone gets their own hat back if N people randomly pick hats from a room where everyone put their hat?”
Read reports →“What is going on with the Japanese Yen, and how does it affect US Treasury Bonds?”
Read report →“Could you estimate the total number of balls used during the entire Wimbledon tournament?”
Read report →“If you toss a fair coin N times, what is the probability that you will get an even number of heads?”
Read report →“What's the expected number of times you'd need to roll a die before you've seen every single side at least one time?”
Read report →“What if C is a uniform random variable ranging from 0 to n?”
Read report →Formats, difficulty and experience
Across all 437 Citadel Securities interview reports.