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ReachMobi Interview Questions

The questions to prepare for ReachMobi interviews, across all roles. Questions from real interview reports rank first. Updated daily.

50questions
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1
SQL & Data ManipulationStart here. 8 questions + 2 drills · ~88 min
Calculate 30-Day User RetentionHard
Practice

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsReachMobi
Deduplicate Streaming RecordsHard
Practice
Practice drill

Deduplicate events within a 24-hour lateness window while retaining the earliest ingested record for each event.

Window FunctionsLag/Leaddata cleaningGoogle
SQL Top 10% Creators by EngagementMedium
Practice
Practice drill

Rank TikTok creators by 30-day engagement and return the top 10% using aggregation and window functions.

Date Functionssql queryData AnalysisTikTok
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2
Metrics8 questions · ~68 min
Investigate User Engagement DeclineMedium

Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.

RetentionDiagnosisEngagement MetricsReachMobi
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3
Execution8 questions · ~68 min
Manage Technical Debt DeliberatelyMedium

Explain how you would prioritize and execute technical debt work without losing stakeholder alignment or delivery momentum.

Trade-offsRisk AssessmentScope ManagementReachMobi
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4
Coding8 questions · ~68 min
Choosing Data Structures for ProblemsMedium

Explain how to choose the right data structure based on access patterns, constraints, and complexity tradeoffs.

Hash TablesTreesGraphsReachMobi
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5
Product Sense3 questions · ~25 min
Balance Revenue and User ExperienceEasy

Approach for balancing monetization with user experience in a product decision.

User NeedsValue PropositionProduct VisionReachMobi
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6
System Design8 questions · ~68 min
Building an Internal Tool StackMedium

Assesses your ability to choose practical technologies for internal tooling needs.

ReachMobi
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7
More topics7 questions · ~59 min
Test a New Monetization StrategyHard

Tests experimental design for monetization changes using rigorous measurement.

ReachMobi
Balance Growth and MonetizationMedium

Tests strategic tradeoffs between growth and monetization for a mobile advertising and PR product.

Trade-offsReachMobi
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.