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62 verified questions from 80+ reports · Updated October 2026
Read the full Citadel interview guide
Interview Type
Coding
Algorithm rounds
OA
Multiple choice + coding
Phone Screen
First technical screen
System Design
Design rounds
Deep Dive
Resume & fundamentals
Behavioral
BQ
Most asked (7)
All (18)
OA
Most reported
Most recent
#1
OA
Medium · 6 reports
Last reported Sep 2026
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NXT OA Multiple-Choice Topics (OS, Systems, Complexity)
#2
OA
Medium · 5 reports
Last reported Jun 2026
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Count (Distinct) Palindromic Substrings (LC 647 variant)
#3
Stale
OA
Medium · 5 reports
Last reported Aug 2025
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Earliest Free Meeting Slot from Event Strings
#4
Stale
OA
Easy · 3 reports
Last reported Sep 2025
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Min Changes to Make Password a K-Periodic Palindrome
#5
Stale
OA
Easy · 3 reports
Last reported Mar 2025
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Best Substring by Prefix/Suffix Match Score
#6
OA
Easy · 3 reports
Last reported Jun 2026
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Tree Diameter Endpoints via Double BFS (LC 1245-style)
#7
OA
Easy · 3 reports
Last reported Jun 2026
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Token Expiry and Reset Simulation (LC 1797-style)
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