Junior Quantitative Trader applicants have rated the interview process at Old Mission with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 50% positive. To compare, the company-average is 39.4% positive. This is according to Glassdoor user ratings.
Candidates applying for Junior Quantitative Trader roles take an average of 45 days to get hired, when considering 2 user submitted interviews for this role. To compare, the hiring process at Old Mission overall takes an average of 18 days.
Common stages of the interview process at Old Mission as a Junior Quantitative Trader according to 2 Glassdoor interviews include:
Phone interview: 40%
Group panel interview: 20%
Skills test: 20%
One on one interview: 20%
Here are the most commonly searched roles for interview reports -
I applied online. I interviewed at Old Mission in Jun 2026
Interview
OA 35 min for 25 quant problems followed by a leetcode-esque problem in 25 mins. The quant problems are pretty doable but you need to be very fast otherwise you won't score high enough. The leetcode problem's logic is trivial hash-maps but getting the right format output is the hardest and one needs to recall a lot of syntax while you can't use google search.
Interview questions [1]
Question 1
typical easy/med greenbook
leetcode hashmaps application and wish I recalled fstring format
Started with a talk with the recruiter, and then proceeded after an online technical screen to various rounds of interviews with the trading team, followed lastly by a call with one of the partners. Super streamlined process, and they were very honest and straightforward the whole time. Worked around my schedule very well.
Interview questions [1]
Question 1
Questions were mostly very standard trading interview questions (think games and stats etc), really enjoyed my time doing them.
I applied online. The process took 6 weeks. I interviewed at Old Mission (Orland Park, IL) in Mar 2018
Interview
My interview process started with many phone conversations excellent with Patrick and Kyle. I had one last obstacle, however, and that was a phone interview with someone from the Chicago office.
Interview questions [1]
Question 1
You have a bag of coins of which one half are real and the other half are fake.
You need to pay for 1 1/2 hours of parking at a meter where one quarter gives you 15 minutes.
Every time you put in a fake quarter the meter time is reset to 0.
How many coins will you have to pull out of the bag ?