Top 31
Prep plan
Updated weekly · Last refresh Aug 30

Planet Software Engineer Interview Questions

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

31questions
~5htotal time
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1
CodingStart here. 8 questions · ~70 min
Detect Cycles in Directed GraphMedium
Practice

Use DFS with recursion-state tracking to detect whether a directed dependency graph contains a cycle.

dfscycle detectionGraphsPlanet
Stream Coordinate Data EfficientlyHard

Tests streaming data processing design that is memory efficient.

memory leakStream Processingperformance analysisPlanet
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2
Execution3 questions · ~26 min
Design a Production Rollback PlanMedium

Design a rollback plan for a failed production deployment, including triggers, ownership, validation, and safe recovery steps.

Rollback PlanSuccess CriteriaRisk AssessmentPlanet
Monitor Network Latency GloballyHard

Tests system design for global observability and reliability of latency monitoring.

monitoringTechnical Fluencydistributed teamsPlanet
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3
SQL & Data Manipulation3 questions + 3 drills · ~56 min
4
Behavioral & Leadership13 questions · ~114 min
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5
More topics4 questions · ~35 min
Ingest and Process Image DataHard

Tests scalable pipeline design for high-volume data ingestion and processing.

Data QualityBatch ProcessingOrchestrationPlanet
Design an E-Commerce SystemHard

Evaluates system design thinking across security and observability for an e-commerce application.

monitoringSecurityPlanet
Fault-Tolerant Telemetry ServiceHard

Tests fault tolerance, streaming architecture, and reliability under partial failures.

Stream Processingtelemetryfault tolerancePlanet
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The finish line: interview-readyComplete all 31 questions plus 3 hands-on drills to finish this plan.