Junior Quantitative Trader
Posted Aug 19, 2026 · We last checked this listing on Oct 6, 2026
Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a data project where your first answer turned out to be wrong.
What they are checking: Whether they check their own work and stay humble, which traders need from support staff.
What do you know about how a proprietary trading firm makes money?
What they are checking: Whether they understand market making and risk-taking with the firm's own capital.
Why do you want to learn trading on a desk rather than work as a pure researcher?
What they are checking: Whether they truly want the hands-on, fast-paced seat the posting describes.
What would you do
During the day you notice a position that does not match what the trader expects. What do you do?
What they are checking: Whether they raise reconciliation issues immediately, since small breaks can become real losses.
A trader asks you for an analysis in ten minutes that would normally take an hour. How do you handle it?
What they are checking: Whether they can deliver a useful rough answer fast and be clear about its limits.
About the work
You have a day of trade data in a pandas DataFrame. How would you calculate realized P&L by strategy?
What they are checking: Whether their Python is practical enough to support live desk analysis from day one.
Write a SQL query in your head that finds every trade where the fill price was far from the mid price at the time. Talk me through it.
What they are checking: Whether they can query databases to surface anomalies, a task the posting names directly.
A coin is flipped until two heads in a row appear. What is the expected number of flips?
What they are checking: Comfort with probability reasoning, which underpins quick decisions on a trading desk.
How would you tell whether a strategy's backtest results are real or just noise?
What they are checking: Statistical judgment about overfitting, sample size and significance in trading research.
How would you monitor risk on a set of futures positions in real time?
What they are checking: Whether they understand exposure, limits and alerts that keep a desk safe.
Practice this interview out loud.
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Practice this out loudThe full job description
As published by DV Trading.