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

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easy0/18

medium0/45

hard0/41

0/104

Solved

CategoryCompanyStatus

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