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Updated weekly · Last refresh Aug 30

The Thaddeus Foundation Software Engineer Interview Questions

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

16questions
~3htotal time
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1
CodingStart here. 4 questions · ~41 min
First Non-Repeating CharacterEasy
Practice

Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.

Hash TablesStringsSearchingThe Thaddeus Foundation
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonThe Thaddeus Foundation
Debug a Complex IssueMedium

Tests systematic debugging skills and ability to reason about root causes.

Hash TablesArraysData WranglingThe Thaddeus Foundation
DFS vs BFSMedium

Tests understanding of core algorithms and when each approach is appropriate.

QueueTreesGraphsThe Thaddeus Foundation
2
Execution3 questions · ~31 min
Secure User Data DesignMedium

Tests secure architecture thinking, privacy controls, and practical safeguards for user data.

Trade-offsSuccess CriteriaRisk AssessmentThe Thaddeus Foundation
Optimizing an Existing AppMedium

Tests performance analysis, prioritization, and safe optimization practices.

Trade-offsSuccess CriteriaRisk AssessmentThe Thaddeus Foundation
Designing a New FeatureMedium

Tests requirements-to-design translation, tradeoffs, and ability to plan a maintainable feature.

Trade-offsRoadmappingScope ManagementThe Thaddeus Foundation

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3
Behavioral & Leadership9 questions · ~92 min
Prioritizing Competing DeadlinesEasy

Tests prioritization under pressure, including trade-off judgment, stakeholder communication, and ownership of outcomes.

OwnershipDealing With AmbiguityPrioritizationThe Thaddeus Foundation
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