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HashedIn by Deloitte Software Engineer Interview Questions

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

50questions
~10htotal time
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1
CodingStart here. 11 questions · ~132 min
Move Zeros to the End of ArrayEasy
Practice

Rearrange an array to move all zeros to the end while maintaining the order of non-zero elements.

ArraysSortingTwo PointersHashedIn by Deloitte
Knight Moves on a ChessboardEasy
Practice

Generate legal white knight destinations using fixed offsets, board bounds, and friendly-piece checks in O(1) time.

RecursionMatrixGraphsHashedIn by Deloitte
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2
SQL & Data Manipulation11 questions + 2 drills · ~152 min
Second Maximum Salary QueryEasy
Practice

Use DENSE_RANK and a LEFT JOIN to find active HashedIn employees earning the second-highest distinct salary.

sql queriesHashedIn by Deloitte
Library Management Database DesignMedium

Tests your ability to model entities and relationships for a real-world library domain using SQL concepts.

JoinsData WranglingCTEsHashedIn by Deloitte
SQL Duplicate DetectionEasy
Practice
Practice drill

Find duplicate customer profiles by grouping on identifying fields and returning only repeated records.

Group ByHavingAggregationsAdtalem Global EducationAmerisave MortgageCitrine Informatics
SQL for Ranked RetrievalMedium
Practice
Practice drill

Find employees earning the second-highest active salary using DENSE_RANK and a department join.

sql queryHashedIn by Deloitte
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3
System Design11 questions · ~132 min
Design a URL Shortening ServiceHard

Design a URL shortening service that routes, ranks, and monitors links at scale.

Feature StoreModel ServingHashedIn by Deloitte
Design a Real-Time ML Feature StoreHard

Design a shared feature store for training and low-latency inference across many ML systems with strict freshness and consistency needs.

Feature StoreFeature DriftModel ServingHashedIn by Deloitte
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4
Security & Infrastructure7 questions · ~84 min
REST API Design PrinciplesMedium

Tests knowledge of REST constraints, API design tradeoffs, and why REST is beneficial.

InfrastructureData WranglingHashedIn by Deloitte
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5
Execution7 questions · ~84 min
Production Performance Deep DiveMedium

Tests deeper production incident handling, diagnostics, and remediation planning.

Launch PlanningTrade-offsRisk AssessmentHashedIn by Deloitte
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6
Behavioral & Leadership3 questions · ~36 min
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.