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Updated weekly · Last refresh Oct 17

Facebook Software Engineer Interview Questions

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

50questions
~9htotal time
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1
CodingStart here. 14 questions · ~155 min
Binary Tree DiameterMedium
Practice

Compute the longest path between any two nodes in a binary tree using postorder depth-first traversal.

dfsAlgorithmsFacebook
BFS Matrix PathfindingMedium
Practice

Use BFS to return a shortest four-directional path from the top-left to the bottom-right of a binary matrix.

ArraysbfsData StructuresFacebook
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2
System Design14 questions · ~155 min
Design Facebook Post PrivacyHard

Assesses system design for access control and visibility logic at Facebook scale.

social mediaFacebook
Scale Concurrent RequestsHard

Evaluates scalability strategies for high concurrency systems.

scalabilityconcurrencyFacebook
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3
Security & Infrastructure11 questions · ~122 min
Network Routing and SwitchingHard

Tests depth of network fundamentals and routing protocol understanding.

NetworkingFacebook
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4
Execution4 questions · ~44 min
Walk Me Through Problem SolvingMedium

Assesses problem-solving process, clarity, and step-by-step execution.

Problem SolvingFacebook
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5
Behavioral & Leadership4 questions · ~44 min
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6
More topics3 questions · ~33 min
Data Governance Best PracticesMedium

Assesses your understanding of governance principles for managing data quality, access, and compliance.

best practicesFacebook
Handling Real-Time Sync and StateHard

Assesses system design thinking for real-time sync, state consistency, and AI integration.

real-time dataFacebook
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Retention Rate QueryMedium
Practice
Practice drill

Calculate Disney+ January cohort retention in February using a CTE, LEFT JOIN, date filters, and distinct user counts.

sql queryData AnalysisDDisney Entertainment & SportsTuroIntuit
Analyze Signup Funnel Drop-OffHard
Practice
Practice drill

Use CTEs, joins, and aggregations to measure user drop-off across a multi-step signup funnel.

JoinsCase WhenAggregationsFacebookIntuitAsana
SQL Top 10% by EngagementMedium
Practice
Practice drill

Rank Facebook users by total session duration and return the top 10% using aggregation and NTILE.

Rankingtop kFacebookActivisionAppsFlyer
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.