I applied online. The process took 3 weeks. I interviewed at Interactive Brokers (Greenwich, CT) in Dec 2023
Interview
Two rounds of interviews with quant developers: the interviewers ask about algorithms, data structure, and probabilities.
One final round with the department's Chief: ask about probability, finance (binomial tree) as well as a brain teaser programming question.
Interview questions [1]
Question 1
Data Structure (dictionary, heap), Algorithms (sorting, dynamic programming, array)
I applied through a recruiter. The process took 1 week. I interviewed at Interactive Brokers (Greenwich, CT) in Oct 2023
Interview
I did the following steps
1) Behavioral Assessment
2) Phone call with an HR person
3) Technical interview
The first takes only 5min to complete and you are asked what traits you consider important for your co-workers. During the HR phone call you are asked typical question like immigration status, salary expectations etc etc. During technical interview I had to solve 2 coding problems in Python, one probability problem and one question in Pandas.
Interview questions [1]
Question 1
1) Sum of squares from 1 to N
2) Square root of a number with 10^-6 accuracy
3) You have 3 fair coins and one with heads on both sides. You randomly chose one coin and you throw it 4 times and you get heads in all 4 throws. What is the probability that you chose the unfair coin.
4) Join three dfs in Pandas
I applied through a recruiter. The process took 4 weeks. I interviewed at Interactive Brokers (Budapest) in Feb 2023
Interview
Multiple rounds of interview. Short conversation in English with a recruiter, then I got a short online quiz, and was quickly invited to the first round of onsite interview with live coding, discussing technical topics, solving some easy math problems. Then I talked to some higher ups, that went well too, so a few days later I got an invitation to yet another interview round. I solved some math problems, was told that I made it to the next round again, which involved some simple coding and pretty much no math.
Interview questions [1]
Question 1
The math questions are too specific, I don't think I can share them, but some more general topics were touched on too, e.g. what kind of design patterns I know, what is my opinion about them, what are some new features of modern (C++14 or newer) C++, etc.
