Old Mission Capital Interview Process & Prep
Old Mission is a Chicago-based proprietary trading firm and options/ETF market maker. The process starts with an online assessment, then several technical rounds heavy on probability, expectation, and mental math, with options and market-making intuition for trading roles and clean coding for engineers. There is no scripted game on this page -- the bar is fast, accurate probabilistic reasoning and trading sense.
The Old Mission Capital interview funnel
1. Online Assessment
Timed - math + codingThe process opens with a timed online assessment covering quantitative/probability questions and (for engineering) coding. Speed and accuracy both matter.
2. Probability & Mental Math
45-60 min - videoCore probability, expectation, statistics, and mental math under time pressure, with follow-ups. This is the heart of the trading screen.
3. Options & Market-Making Round
45-60 min - trading intuitionFor trading roles: options basics, pricing intuition, market-making (quote a market, manage risk), Kelly sizing, and game-theory-flavored decision problems.
4. Onsite - Hardest Rounds
Final rounds - the toughest reported problemsThe hardest reported Old Mission problems across every topic -- probability, options/market-making, Kelly sizing, and coding. (These are the hard-rated problems; the earlier rounds cover the easy/medium set, so nothing here repeats.)
Old Mission Capital interview — FAQ
What is the Old Mission Capital interview process?
Old Mission is a Chicago-based proprietary trading firm and options/ETF market maker. The process starts with an online assessment, then several technical rounds heavy on probability, expectation, and mental math, with options and market-making intuition for trading roles and clean coding for engineers. There is no scripted game on this page -- the bar is fast, accurate probabilistic reasoning and trading sense. The loop runs 4 stages: Online Assessment, Probability & Mental Math, Options & Market-Making Round, Onsite - Hardest Rounds.
How many rounds does Old Mission Capital have?
4 stages in total, starting with the Online Assessment and ending with the Onsite - Hardest Rounds.
How do I prepare for the Old Mission Capital interview?
Work the stage notes above, then drill the Old Mission Capital interview-questions set and the Old Mission Capital online-assessment practice — each problem has a full worked solution.