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Unknowns Software Engineer Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 15 questions · ~135 min
Longest Substring Without RepeatsMedium
Practice
Recently asked

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersUnknowns
Linked List ReversalEasy
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Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysUnknowns
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2
SQL & Data Manipulation14 questions + 2 drills · ~146 min
Second Highest Trader SalaryEasy
Practice
Recently asked

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingUnknowns
Explain SQL Join TypesEasy
Recently asked

Explain INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with examples and when to use each.

JoinsData WranglingGroup ByUnknowns
SQL Join and Group By PracticeHard
Practice
Practice drill

Join SAT data, aggregate monthly center performance, and compare average scores with LAG.

JoinsGroup BysqlThe College Board
Find Duplicate Rows QueryEasy
Practice
Practice drill

Identify duplicate Dover India asset records using GROUP BY and HAVING, excluding the unique record identifier.

Data WranglingsqlAggregationsDover IndiaDataAnnotation
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3
Execution6 questions · ~54 min
Your Strengths and WeaknessesEasy

Tests self-awareness and how you position yourself for success in an Account Executive role at Aqr.

Trade-offsSuccess CriteriaRisk AssessmentUnknowns
Tell Me About Your ProjectsEasy
Recently asked

Tests your ability to select relevant work and communicate impact clearly for a research scientist role.

Success CriteriaRoadmappingScope ManagementUnknowns
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4
System Design3 questions · ~27 min
System Design for UnknownsHard
Recently asked

Tests your system design skills, tradeoff reasoning, and technology selection for Unknowns-scale needs.

system designdistributed systemsarchitectureUnknowns
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5
Security & Infrastructure8 questions · ~72 min
Multithreading Concepts and BenefitsMedium
Recently asked

Tests your understanding of concurrency, parallelism, and practical benefits in software.

HardwareNetworkingos internalsUnknowns
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6
Behavioral & Leadership4 questions · ~36 min
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.