Senior Trader, Brokerage
Posted Oct 1, 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 the worst trading error you have been involved in. What happened and what changed afterward?
What they are checking: Whether they own mistakes fast and push for control fixes, which matters more than never making one.
How do you mentor a less experienced trader without slowing down the desk?
What they are checking: Whether they can lift the team's judgment as a senior subject matter expert while still executing their own flow.
Describe a time you had to tell a portfolio manager their instructions would likely hurt execution.
What they are checking: Whether they give trusted, direct guidance to clients and colleagues rather than simply following orders they doubt.
What would you do
A portfolio trade has a few names that are badly lagging the rest of the list. How do you manage the basket's risk?
What they are checking: Whether they can think at the portfolio level about residual risk and tracking, not just name by name.
A news headline hits while you are halfway through a large order. Walk me through your next sixty seconds.
What they are checking: Whether they react with discipline, communicate with the client and avoid both panic and freezing under pressure.
A sales trader pushes you to show a client's order to a contra you think could leak it. What do you do?
What they are checking: Whether they protect client information and follow control frameworks even when there is pressure to be helpful.
About the work
You get a large order in a thinly traded mid-cap name with a full-day horizon. How do you decide between working it algorithmically, going to a block venue or using capital?
What they are checking: Whether they weigh impact, information leakage and urgency with real market structure knowledge instead of a default habit.
Walk me through how you would handle an index rebalance where many of your names trade into the close.
What they are checking: Whether they understand closing auction dynamics, imbalance data and the risk of concentrated flow at a single moment.
How do you define and prove best execution to a client who thinks they got a bad fill?
What they are checking: Whether they can explain execution quality with benchmarks and evidence instead of defending the trade by instinct.
How do you pick and evaluate brokers and algorithms for different order types?
What they are checking: Whether they use transaction cost analysis and venue data to make routing choices rather than relying on relationships.
What recent change in US equity market structure do you think matters most for institutional execution, and why?
What they are checking: Whether they stay current on market structure and can connect a rule change to how they actually trade.
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Practice this out loudThe full job description
As published by Northern Trust.