Top 30
Prep plan
Updated weekly · Last refresh Oct 17

Planet Software Engineer Interview Questions

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

30questions
~4htotal time
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1
CodingStart here. 8 questions · ~71 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
Applying SOLID and RefactoringMedium

Evaluates code quality practices, maintainability, and disciplined engineering habits.

refactoringsolid principlesPlanet
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2
Execution3 questions · ~27 min
3
SQL & Data Manipulation3 questions + 3 drills · ~57 min
4
Behavioral & Leadership11 questions · ~97 min
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5
More topics5 questions · ~44 min
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
Your Networking KnowledgeEasy

Tests baseline networking fundamentals relevant to building and operating services.

backgroundNetworkingtechnical experiencePlanet
Draw an App and Data ModelHard

Assesses your ability to translate requirements into architecture and a relational data model.

architecturePlanet
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The finish line: interview-readyComplete all 30 questions plus 3 hands-on drills to finish this plan.