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Citadel Securities Software Engineer Interview Questions

The questions to prepare for a Citadel Securities Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
CodingStart here. 19 questions · ~167 min
Reverse Linked ListEasy
Practice

Reverse a singly linked list iteratively and recursively in Python.

RecursionLinked ListsbasicsCitadel Securities
Largest Subarray With Sum kMedium
Practice

Find the longest contiguous array subarray summing to k using prefix sums and a hash map.

AlgorithmsCitadel Securities
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2
Execution11 questions · ~97 min
CPU Cache Locality ImpactMedium
Recently asked

Tests performance reasoning about caches, locality, and memory access patterns.

optimizationperformance analysisCitadel Securities
Intermittent Inter-DC Latency SpikesMedium
Recently asked

Tests incident response and root-cause analysis for intermittent network performance.

latencyNetworkingProblem SolvingCitadel Securities
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3
Security & Infrastructure8 questions · ~70 min
Thread vs ProcessMedium

Assesses core concurrency concepts and their practical implications.

concurrencyCitadel Securities
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4
System Design4 questions · ~35 min
Random Generator From ProbabilitiesHard

Evaluates algorithm design and probabilistic reasoning.

Citadel Securities
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5
Behavioral & Leadership5 questions · ~44 min
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6
More topics3 questions · ~26 min
Multicast and Exchange Data ConsistencyHard

Evaluates distributed data consistency reasoning and correct aggregation logic.

Citadel Securities
Data Processing and Job ExecutionMedium

Evaluates your approach to building reliable pipelines and orchestrating job execution.

data processingExecutionCitadel Securities
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Sum From 1 to 1,000,000Easy
Practice
Practice drill

Calculate the sum of integers from 1 to 1,000,000 using PostgreSQL aggregation and filtering.

AlgorithmsVirtu Financial
SQL Query for Top ProductsMedium
Practice
Practice drill

Rank Natural Intelligence products by completed revenue in the last completed quarter using joins, aggregation, and a date CTE.

sql queryperformance analysisNatural Intelligence
Top Ad Campaigns by ConversionMedium
Practice
Practice drill

Rank InMobi Exchange campaigns by conversion rate using joins, aggregation, a CTE, and deterministic ordering.

sql queryperformance analysisInMobi
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.