Machine Coding Sheet
Meta Machine Coding Interview
Top low-level design (LLD) and machine coding questions frequently asked in Meta interviews. Master these to clear the LLD round.
Overall progress
0/104 solved
0%
easy0/18
medium0/45
hard0/41
0/104
Solved
Infrastructure
0/4 solved
| Status | Star | Problem | Difficulty | Key Focus | Notes |
|---|---|---|---|---|---|
Notification Service Asked by:MetaAmazonApple+1 more | Medium | Factory Method, Strategy Pattern, Decorator Pattern, Rate Limiting | |||
Distributed ID Generator Asked by:TwitterMetaMicrosoft+1 more | Medium | Snowflake Strategy, Clock Providers, Resilient Clock-Skew Backoffs, Thread-Safe Bitwise Math | |||
A/B Testing Library Asked by:NetflixMetaOptimizely+1 more | Medium | Hashing, User Bucketing | |||
Like Count System (Sharded) Asked by:TwitterMetaByteDance | Medium | Atomic Longs, Sharding |
Real-time
0/2 solved
| Status | Star | Problem | Difficulty | Key Focus | Notes |
|---|---|---|---|---|---|
Live Comments System Asked by:MetaYouTubeTwitch+1 more | Medium | Buffer Management, Ordering | |||
Live Reactions System Asked by:MetaByteDanceTwitter+1 more | Hard | Aggregator, High Write Load |
Social
0/5 solved
| Status | Star | Problem | Difficulty | Key Focus | Notes |
|---|---|---|---|---|---|
Follower / Following System Asked by:MetaTwitterLinkedIn+1 more | Easy | Asymmetric Relation Modeling | |||
Mentions & Tagging System Asked by:MetaTwitterSlack+1 more | Easy | String Parsing, Notifications | |||
News Feed Ranker Asked by:MetaByteDanceTwitter+1 more | Medium | Scoring Algorithms | |||
Ephemeral Stories Asked by:MetaSnapWhatsApp | Medium | Soft Delete, Expiry Logic | |||
LinkedIn (Social Graph) Asked by:LinkedInMetaTwitter | Hard | Bidirectional BFS, Strategy Pattern, Observer Pattern, Graph Traversals, Concurrent Graph Nodes |
Messaging
0/1 solved
| Status | Star | Problem | Difficulty | Key Focus | Notes |
|---|---|---|---|---|---|
Discord / Slack (Messaging) Asked by:DiscordSlackMeta+1 more | Hard | Session Management, Pub-Sub |
Ads
0/1 solved
| Status | Star | Problem | Difficulty | Key Focus | Notes |
|---|---|---|---|---|---|
Ad-Serving Engine Asked by:GoogleTradeDeskMeta | Hard | Bid Selection, Auction Logic |