Jump Trading Interview Questions

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37 questions
548 companies
3 roles
Last updated Nov 2026

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Quantitative Developer Quantitative Researcher Quantitative Trader

A bag holds 2 red and 2 black balls. Each step you draw two and repaint the second to match the first. How many steps do you expect until all four are the same colour?
10 hours ago
Cards are turned over from a standard deck one at a time. You may say stop at any point and you win if the next card is red. What is the best probability of winning you can achieve?
10 hours ago
Implement a rolling mean and rolling variance over a data stream with O(1) work per update.
+110 hours ago
n independent uniform draws are shown one at a time and you may accept only one, at the moment it is shown. What stopping rule maximises the expected value of the draw you accept?
6 years ago
What is virtual memory and why is it needed? What is the difference between a process and a thread? What goes wrong when several threads access the same memory, and how do you fix it?
+110 hours ago
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Given a string of only 'a' and 'b', return whether every 'a' occurs before every 'b'.
10 hours ago
Given source and destination directory listings, return the files that must be synced: those missing at the destination or differing in size or modification time.
10 months ago
Implement a vector by hand in C++.
+410 hours ago
How does std::unordered_map work internally?
2 years ago
How would you design a Parquet-like columnar file format?
10 months ago
Find the k-th permutation of n elements in lexicographic order.
10 months ago
Given a sequence A of up to 100,000 numbers, find a pair of positions i and j with |i - j| > 1 that minimises A[i] + A[j].
4 years ago
Given 5 cards, implement a function that determines the best poker hand.
3 years ago
Given two lists of (timestamp, value) tuples representing time series, merge them into one time series represented as a list of tuples.
2 years ago
What is the difference between stack and heap memory in C++?
10 months ago
Write an efficient implementation of a lazily initialised singleton in C++.
10 hours ago
A is a Hermitian matrix satisfying A^5 + A^3 + A = 3I. Prove or disprove that A must equal I.
10 hours ago
Given two binary trees, decide whether the second appears as a subtree of the first (same structure and values from some node down). Then optimise your solution.
6 years ago
A bowl holds three balls of three different colours. Each step you take out two and paint one the colour of the other. How many steps on average until all three match?
2 years ago
Suppose you are made responsible for a brand-new market, for example crypto, starting from scratch. What does your timeline for the next three months look like?
10 months ago

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Jump Trading Interview Questions

A bag holds 2 red and 2 black balls. Each step you draw two and repaint the second to match the first. How many steps do you expect until all four are the same colour?

Cards are turned over from a standard deck one at a time. You may say stop at any point and you win if the next card is red. What is the best probability of winning you can achieve?

Implement a rolling mean and rolling variance over a data stream with O(1) work per update.

n independent uniform draws are shown one at a time and you may accept only one, at the moment it is shown. What stopping rule maximises the expected value of the draw you accept?

What is virtual memory and why is it needed? What is the difference between a process and a thread? What goes wrong when several threads access the same memory, and how do you fix it?

Given a string of only 'a' and 'b', return whether every 'a' occurs before every 'b'.

Given source and destination directory listings, return the files that must be synced: those missing at the destination or differing in size or modification time.

Implement a vector by hand in C++.

How does std::unordered_map work internally?

How would you design a Parquet-like columnar file format?

Find the k-th permutation of n elements in lexicographic order.

Given a sequence A of up to 100,000 numbers, find a pair of positions i and j with |i - j| > 1 that minimises A[i] + A[j].

Given 5 cards, implement a function that determines the best poker hand.

Given two lists of (timestamp, value) tuples representing time series, merge them into one time series represented as a list of tuples.

What is the difference between stack and heap memory in C++?

Write an efficient implementation of a lazily initialised singleton in C++.

A is a Hermitian matrix satisfying A^5 + A^3 + A = 3I. Prove or disprove that A must equal I.

Given two binary trees, decide whether the second appears as a subtree of the first (same structure and values from some node down). Then optimise your solution.

A bowl holds three balls of three different colours. Each step you take out two and paint one the colour of the other. How many steps on average until all three match?

Suppose you are made responsible for a brand-new market, for example crypto, starting from scratch. What does your timeline for the next three months look like?

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