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Updated weekly · Last refresh Oct 17

Gartner Software Engineer Interview Questions

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

50questions
~11htotal time
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1
CodingStart here. 11 questions · ~145 min
Number of IslandsMedium
Practice

Count connected groups of land in a binary grid using DFS, and explain the BFS alternative with its complexity.

dfsbfsAlgorithmsGartner
Product of Array Except SelfMedium
Practice

Build an O(n) product array without division by combining prefix and suffix products.

ArraysArray ManipulationAlgorithmsGartner
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2
System Design11 questions · ~145 min
CAP Theorem and Microservice ConsistencyHard

Explain CAP theorem and compare consistency models for reliable microservice communication.

latencydistributed systemsarchitecture patternsGartner
Design Web-Based Employee PortalHard

Design Gartner's Employee Portal with separated modules, secure authentication, role-based authorization, an appropriate stack, and scalable services.

authorizationapi gatewayarchitecture patternsGartner
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3
SQL & Data Manipulation10 questions · ~132 min
Find Customers Missing in Another TableEasy
Practice

Use a LEFT JOIN anti-join to find active customers without Gartner Digital Markets login activity.

SubqueriesJoinsUnionsGartner
Deduplicate and Keep LatestEasy
Practice

Keep the latest valid Gartner Peer Insights review per source key using ROW_NUMBER and deterministic tie-breaking.

Window FunctionsRankingData WranglingGartner
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4
Pipelines5 questions · ~66 min
Backfill Without Duplicate RecordsHard

Approach for rerunning failed pipeline ranges and correcting data safely with idempotent writes and quality checks.

IdempotencyBackfillingQualityGartner
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5
Execution10 questions · ~132 min
Explain REST vs SOAP ClearlyEasy

Explain RESTful APIs and SOAP clearly, focusing on practical differences that matter for delivery and integration decisions.

Trade-offsScope ManagementGartner
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6
Behavioral & Leadership3 questions · ~40 min
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The finish line: interview-readyComplete all 50 questions to finish this plan.