Classdojo Software Engineer Interview Questions

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

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CodingStart here. 14 questions · ~119 min

Linked List ReversalEasy

Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArrays

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Optimizing a Slow ApplicationMedium

Tests performance troubleshooting, measurement, and targeted optimization strategies.

Hash TablesArraysSorting

Classdojo

Implement Binary SearchEasy

Tests algorithm implementation skills and correctness reasoning.

RecursionArraysSearching

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System Design10 questions · ~85 min

Real-Time Message Delivery PrioritizationHard

Design an ML system for real-time chat that predicts delivery risk and prioritizes retries while preserving ordering at massive scale.

Feature StoreModel ServingRecommendation Systems

Classdojo

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 Serving

Classdojo

Design Instagram Stories RecommenderHard

Design Instagram Stories recommendation at Meta scale using retrieval, ranking, re-ranking, and robust monitoring under a 120ms p99 budget.

ML RankingRetrievalRecommendation Systems

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Execution8 questions · ~68 min

Choose Monolith or MicroservicesMedium

Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.

Trade-offsRisk AssessmentScope Management

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Balance Speed, Quality, and ScopeMedium

Describe how you handled a tough trade-off between shipping fast, maintaining quality, and reducing scope.

Trade-offsRisk AssessmentScope Management

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Behavioral & Leadership13 questions · ~111 min

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The finish line: interview-readyComplete all 45 questions to finish this plan.