Interview Questions

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6,535 questions
548 companies
49 roles
Last updated Nov 2026

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1000 people sit in a circle. Person 1 shoots person 2 and passes the gun to person 3, who shoots person 4, and so on, skipping the dead. Who is the last one left?
11 hours ago
Explain Python garbage collection and reference counting. After a = [..], b = a, and then b is rebound to something else, what is a?
11 hours ago
Explain how a kdb database works.
11 hours ago
Given end-of-day price and volume data, what strategies could you build? Walk through the full research workflow.
11 hours ago
What is the __enter__ special method for in Python?
11 hours ago
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What is a Python decorator, and when would you use one?
11 hours ago
Why is kdb fast at processing financial data?
11 hours ago
How would you test a news sentiment factor?
11 hours ago
How do you tune a random forest and cross-validate it? How does a random forest compare with XGBoost, and why does ensembling help?
+111 hours ago
What problem arises when a backtest covers a very long period, and how would you fix it?
11 hours ago
A is a Hermitian matrix satisfying A^5 + A^3 + A = 3I. Prove or disprove that A must equal I.
11 hours ago
X and Y are iid standard normal. What is P(X > 3Y | X > 0)?
11 hours ago
Two bullets sit at random in a six-chamber revolver and the first pull is empty. What is the probability the next pull fires? What if the bullets are known not to be adjacent?
11 hours ago
Reorder a list so equal values sit together and groups appear in the order their value first occurs: input 1, 5, 1, 1, 3, 7, 5 gives 1, 1, 1, 5, 5, 3, 7.
11 hours ago
One of 100 doors hides a prize. You pick a door, then the host opens 98 of the others, all empty, and offers a switch. Should you switch, and what is your chance of winning?
11 hours ago
What is your biggest achievement so far?
10 months ago
You roll a die repeatedly and may cash in the running total at any time, but you lose everything if it ever lands on a perfect square. When should you stop?
10 months ago
f is 0 at irrationals and 1/q at a fraction p/q in lowest terms. At which points is f discontinuous?
2 years ago
Four variables have all pairwise correlations 1/2 except corr(a,d). What range can corr(a,d) take? Compute it in code.
11 hours ago
Random variables a, b, c satisfy corr(a,b) = 1/2 and corr(b,c) = 1/2. What range can corr(a,c) take?
11 hours ago

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Interview Questions

1000 people sit in a circle. Person 1 shoots person 2 and passes the gun to person 3, who shoots person 4, and so on, skipping the dead. Who is the last one left?

Explain Python garbage collection and reference counting. After a = [..], b = a, and then b is rebound to something else, what is a?

Explain how a kdb database works.

Given end-of-day price and volume data, what strategies could you build? Walk through the full research workflow.

What is the enter special method for in Python?

What is a Python decorator, and when would you use one?

Why is kdb fast at processing financial data?

How would you test a news sentiment factor?

How do you tune a random forest and cross-validate it? How does a random forest compare with XGBoost, and why does ensembling help?

What problem arises when a backtest covers a very long period, and how would you fix it?

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

X and Y are iid standard normal. What is P(X > 3Y | X > 0)?

Two bullets sit at random in a six-chamber revolver and the first pull is empty. What is the probability the next pull fires? What if the bullets are known not to be adjacent?

Reorder a list so equal values sit together and groups appear in the order their value first occurs: input 1, 5, 1, 1, 3, 7, 5 gives 1, 1, 1, 5, 5, 3, 7.

One of 100 doors hides a prize. You pick a door, then the host opens 98 of the others, all empty, and offers a switch. Should you switch, and what is your chance of winning?

What is your biggest achievement so far?

You roll a die repeatedly and may cash in the running total at any time, but you lose everything if it ever lands on a perfect square. When should you stop?

f is 0 at irrationals and 1/q at a fraction p/q in lowest terms. At which points is f discontinuous?

Four variables have all pairwise correlations 1/2 except corr(a,d). What range can corr(a,d) take? Compute it in code.

Random variables a, b, c satisfy corr(a,b) = 1/2 and corr(b,c) = 1/2. What range can corr(a,c) take?

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