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Companies / Citadel

Citadel interview questions

Explore questions associated with Citadel. Review the source details, then use the workspace for code, notes, and diagrams.

65 questions in the library. A source association does not guarantee a future interview question.

Behavioral and leadership · Coding · Machine learning · Other questions · System design

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Citadel interview questions | SysRound

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65 questions

Showing 1–25

System designDifficulty not specified
Design a real-time stock data streaming system
Design a real-time stock data streaming system that allows users to subscribe to live market data feeds, receive low-latency price updates, and process high-throughput…
Companies: Citadel, Bloomberg
Last reported Oct 2026
Open workspace
CodingDifficulty not specified
Design a Redundant Feed Arbitrator Class
Design a class that consumes messages from multiple redundant feeds carrying the same sequenced content and republishes a single clean, ordered, deduplicated stream where a…
Companies: Citadel
Last reported Oct 2026
Open workspace
CodingDifficulty not specifiedLeetCode 1656
Design an Ordered Stream
Maintain an array-backed stream of n (id, value) pairs arriving out of order and, on each insert, return the largest contiguous chunk of values starting…

Page 1 of 3

Companies: Citadel

Last reported Oct 2026

Other questionsDifficulty not specified

Make a trie tree for word

Companies: Citadel

Last reported Jan 2026

CodingDifficulty not specified

The technical question was a Data Structures and Algorithms question of Leetcode Medium but couched in a way that initially made it seem like a finance question initially, as it was about balances. There was an expectation that you would be able to implement the required algorithm from memory.

The technical question was a Data Structures and Algorithms question of Leetcode Medium but couched in a way that initially made it seem like a…

Companies: Citadel

Last reported Nov 2025

Other questionsDifficulty not specified

Do you know what the role you are applying for is and what it demands?

Companies: Citadel

Last reported Sep 2025

CodingDifficulty not specified

15 multiple choice on systems, 2 leetcode med or hard

Companies: Citadel

Last reported Aug 2025

CodingDifficulty not specified

dp leetcode problems, leetcode problems which are heavy on the implementation. Do the citadel leetcode list

Companies: Citadel

Last reported Jan 2025

Other questionsDifficulty not specified

a problem about graph and bfs

Companies: Citadel

Machine learningMedium

Analyze Correlations and Generate Gaussians

Companies: Citadel

Probability

Machine learningMedium

Analyze Town Temperatures and Select Predictors for NYC

Companies: Citadel

Machine learningMedium

Build a baseline linear regression pipeline

Companies: Citadel

Feature Engineering · Regression & Statistical Modeling

Machine learningEasy

Choose Between Precision and Recall for a Classification Decision

Companies: Citadel

Machine learningHard

Choose models for trading tasks

Companies: Citadel

ML Fundamentals · Model Evaluation

CodingDifficulty not specified

Classic data structure and algorithm coding problems .

Companies: Citadel

CodingDifficulty not specified

Classic question from leetcode hard

Companies: Citadel

Machine learningHard

Classify Variable-Length, Unordered Point Sequences with Missing Features

Companies: Citadel

Feature Engineering · ML Coding

Other questionsDifficulty not specified

Coin change dynamic programming plus

Companies: Citadel

Other questionsDifficulty not specified

Convert a string to an int without using Java library.

Companies: Citadel

CodingMediumLeetCode 210

Course Schedule II

Given numCourses and prerequisite pairs, return any ordering of courses that satisfies all prerequisites or an empty array if impossible — this is essentially computing…

Companies: Citadel, Amazon, Anduril, Apple +11

Breadth-First Search · Depth-First Search · Graph Theory · Topological Sort

Machine learningEasy

Decide Whether an LSTM Is Appropriate for Sequence Data

Companies: Citadel

Other questionsDifficulty not specified

Design battleship the game where players take turns in python.

Companies: Citadel

Machine learningHard

Design city home-price prediction system

Companies: Citadel

Feature Engineering · ML System Design

Machine learningHard

Design Framework for Robust House-Price Prediction Model

Companies: Citadel

Machine learningHard

Design regression and classification ML pipelines

Companies: Citadel

Feature Engineering · Supervised Learning