What do trader interviews actually test?

Probability, expected value, fast mental arithmetic, and trading judgement - usually through betting games and two-sided quoting rather than formal questions. Interviewers care about your reasoning as much as your final number.

Do I need a finance degree to interview for a trading role?

Usually not. Most desks test probabilistic reasoning and decision-making rather than finance knowledge, so backgrounds in maths, physics, computer science and engineering are common.

How do I prepare for the numerical screen?

Practise no-calculator arithmetic under a timer until it is automatic. It is a pure skill and it responds quickly to daily reps - and clearing it is what unlocks the rest of the process.

Trader Interview Questions

Trader interviews test how fast and how soundly you reason about uncertainty: probability and expected value, quick mental arithmetic, and market-making games where you quote a price and manage the risk you take on.

Trading interviews are less about what you know than how you decide. Expect probability and expected-value problems posed as dice, coins, cards or bets; fast arithmetic woven into larger questions; and quoting games where you post a two-sided market and update as information arrives.

Most processes open with a timed numerical screen before anyone speaks to you, so arithmetic speed is a prerequisite rather than a differentiator. The later rounds are where judgement is assessed: how you size risk, how you handle being picked off, and whether you can explain your reasoning while under time pressure.

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Topics:Probability Expected Value Combinatorics Brainteasers Random Variables Market Making & Betting Games

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Frequently asked questions

What do trader interviews actually test?: Probability, expected value, fast mental arithmetic, and trading judgement - usually through betting games and two-sided quoting rather than formal questions. Interviewers care about your reasoning as much as your final number.
Do I need a finance degree to interview for a trading role?: Usually not. Most desks test probabilistic reasoning and decision-making rather than finance knowledge, so backgrounds in maths, physics, computer science and engineering are common.
How do I prepare for the numerical screen?: Practise no-calculator arithmetic under a timer until it is automatic. It is a pure skill and it responds quickly to daily reps - and clearing it is what unlocks the rest of the process.