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Updated weekly · Last refresh Aug 30

Facebook Software Engineer Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 13 questions · ~122 min
Find Two Sum IndicesEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysSortingFacebook
Longest Contiguous Subarray Sum Equals KMedium
Practice

Find the longest contiguous subarray with sum k using prefix sums and a hash map in O(n) time.

Facebook
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2
System Design13 questions · ~122 min
Scale Input by 100xMedium
Recently asked

Tests scalability analysis, complexity reasoning, and identifying bottlenecks.

performancescalabilityFacebook
Global Traffic Spike HandlingHard
Recently asked

Tests scalability planning, load management, and resilience strategies under sudden demand.

system architecturescalabilityFacebook
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3
Security & Infrastructure12 questions · ~113 min
Network Routing and SwitchingHard

Tests depth of network fundamentals and routing protocol understanding.

NetworkingFacebook
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4
Execution4 questions · ~38 min
Walk Me Through Problem SolvingMedium

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

Problem SolvingFacebook
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5
SQL & Data Manipulation3 questions + 3 drills · ~58 min
Parse CSV in PythonMedium

Evaluates data parsing skills and systematic debugging approach.

DebuggingFacebook
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 Day-Over-Day GrowthMedium
Practice
Practice drill

Calculate daily active Instagram Creators and day-over-day growth using a date spine, aggregation, and LAG.

Date FunctionsAggregationsFacebook
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 kFacebook
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6
Behavioral & Leadership4 questions · ~38 min
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7
More topics1 question · ~9 min
Handling Real-Time Sync and StateHard

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

real-time dataFacebook
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.