I had a phone screening call from a recruiter, they asked some standard probability questions, bayes rule, and expected value about dices. Overall experience was pretty good. Make sure you prepare your probability
Domande di colloquio [1]
Domanda 1
Expected value, if throwing a dice, 2 dices and 3 dices with option to reroll.
Ho presentato la mia candidatura online. La procedura ha richiesto 2 giorni. Ho sostenuto un colloquio presso Jane Street nel mese di apr 2014
Colloquio
The round 1 interview is mental maths and you are not allowed to use any pen, paper or calculator. Actually my interviewer was an HR, and she asked me questions that were randomly picked from a problem set.
Interview questions:
1. 72*12%
2. 2,000,000 - 2,022
3. 27*32
4. There is a set of pokers that aces are excluded. What is the probability of taking the first two cards and both of them are 6?
5. What is your confident level of getting at least 2 right answers in the past 4 questions? At least 3? 4 all right? Answer in percentage.
6. There is a bus with some passengers. It stops at 3 times. At each stop, 2/3 of the passengers get off, and 7 passengers get on. What is the minimum number of passengers before the first stop?
7. There are 4 coins. You can flip the coins and get paid as the number of coins that end in heads. If you are not satisfied with the first flip, you can re-flip the coins once, but you have to accept the second result. What is the fare value of this game?
Ho presentato la mia candidatura online. Ho sostenuto un colloquio presso Jane Street nel mese di nov 2022
Colloquio
Very smooth. Around 30mins first round 1hr for the second round. First round consisted of easier probability based questions. Second round was similar but harder and longer questions. The interview process if approached in a calm composed manner should be easier to analyse
multiple phone interviews and a full-day Zoom interview. Interviews got longer and longer over time, but every person was very kind and helpful with hints when I got stuck. The questions get harder as the rounds progress and generally don't have a closed form answer in the later rounds
Domande di colloquio [1]
Domanda 1
they describe the rules of a game and ask if you want to play it based on your expected earnings