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Updated weekly · Last refresh Sep 22

Apex Software Engineer Interview Questions

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

30questions
~4htotal time
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1
ExecutionStart here. 6 questions · ~49 min
Design an API Under ConstraintsMedium

Design an API by balancing usability, performance, versioning, and operational risk under real product constraints.

Trade-offsRisk AssessmentScope ManagementApex
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2
System Design4 questions · ~33 min
Design a Personalized Product RecommenderHard

Design an end-to-end product recommendation system for a large e-commerce marketplace with strict latency and freshness needs.

Feature StoreFeature DriftModel ServingApex
Design Feature Drift Monitoring SystemHard

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingApex
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3
Coding3 questions · ~24 min
Polymorphism and InheritanceMedium

Evaluates core OOP understanding and practical application in software design.

javaoopApex
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4
Behavioral & Leadership13 questions · ~106 min
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5
More topics4 questions · ~33 min
Data Integrity During System MigrationHard

Approach for preserving correctness during a pipeline migration, including validation, replay safety, and controlled cutover.

ETLIdempotencyQualityApex
Optimizing SQL QueriesMedium

Tests SQL performance tuning skills and practical approaches to query optimization.

SubqueriesJoinsAggregationsApex
Design Patterns and RationaleMedium

Tests architectural judgment and ability to justify patterns based on requirements and constraints.

CommunicationLeadershipOwnershipApex
Simulating an IMU on the GroundHard

Tests your approach to modeling sensor behavior and validating embedded or system integration.

Embedded SystemsApex

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

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

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Detect Consecutive Losing StreaksMedium
Practice
Practice drill

Identify bet365 users with consecutive losing bets above a risk threshold using ordered streak grouping.

abuse trackingData Manipulationsql querybet365
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
The finish line: interview-readyComplete all 30 questions plus 3 hands-on drills to finish this plan.