Machine Coding Sheet

Microsoft Machine Coding Interview

Top low-level design (LLD) and machine coding questions frequently asked in Microsoft 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

0/4 solved

Problem	Difficulty	Key Focus
Parking Lot Asked by:AmazonGoogleMicrosoft+2 more	Easy	Inheritance, Enums, Strategy Pattern
Library Management System Asked by:AmazonMicrosoftGoogle	Easy	Search & Strategy Penalty Logic
Vending Machine Asked by:GoogleAmazonMicrosoft	Medium	State Pattern (Idle/Dispense)
Coffee Machine Asked by:GoogleAmazonMicrosoft	Medium	Decorator Pattern, State Pattern, Inventory Checks, Thread-Safe Brewing

0/4 solved

Problem	Difficulty	Key Focus
Snake & Ladder Asked by:AmazonFlipkartMicrosoft+1 more	Easy	Entity Modeling, Game Loop
Tic-Tac-Toe Asked by:GoogleMicrosoftAmazon+1 more	Easy	Scalable N×N Board & Win Strategies
Deck of Cards / Poker Asked by:SonyMicrosoftZynga	Medium	Rule Engine, Hand Evaluation, Sorting, Kickers Tie-breaking
Chess Game Asked by:AmazonMicrosoftRiot Games	Hard	Validator Strategy & Command Move Reversal

0/11 solved

Problem	Difficulty	Key Focus
Backup Manager Asked by:AWSGoogleMicrosoft+1 more	Easy	Incrementals, RPO/RTO Logic
Elevator System Asked by:GoogleAmazonMicrosoft+1 more	Medium	State, Strategy (Dispatching)
API Rate Limiter Asked by:StripeGoogleAmazon+2 more	Medium	Token Bucket, Sliding Window
Logger Library Asked by:GoogleAmazonSplunk+1 more	Medium	Strategy Formatter & Asynchronous Composite Sinks
File System (Unix-like) Asked by:MicrosoftAppleGoogle+1 more	Medium	Composite Pattern, Concurrent Read/Write Locks, Hierarchical Path Resolution
Distributed ID Generator Asked by:TwitterMetaMicrosoft+1 more	Medium	Snowflake Strategy, Clock Providers, Resilient Clock-Skew Backoffs, Thread-Safe Bitwise Math
Unit Testing Framework Asked by:JetBrainsMicrosoftGoogle	Medium	Reflection, Annotation Logic
In-Memory Key-Value Store Asked by:RedisLabsGoogleAmazon+1 more	Hard	Nested Transactions & Command Logs
Git Version Control Asked by:GitHubGitLabAtlassian+1 more	Hard	Composite Pattern, Hashing, Directed Acyclic Graph (DAG)
In-Memory SQL Database Asked by:OracleMicrosoftAWS	Hard	Query Parser, Row Storage
Package Manager Asked by:npmGitHubMicrosoft+1 more	Hard	Dependency Graph Resolution

0/2 solved

Status	Star	Problem	Difficulty	Key Focus	Notes
		ATM Machine Asked by:GoogleMicrosoftJPMorgan Chase	Medium	Chain of Responsibility & State Pattern
		Splitwise Asked by:UberMicrosoftFlipkart+1 more	Hard	Min-Cash Flow, Graph Modeling

0/5 solved

Problem	Difficulty	Key Focus
Meeting Scheduler Asked by:MicrosoftGoogleUber+1 more	Medium	Concurrency, Interval Trees
Task Planner (Jira-lite) Asked by:AtlassianMicrosoftSlack	Medium	State Pattern, Observer Pattern, Factory Method, Capacity Check
Survey Monkey (Survey System) Asked by:QualtricsGoogleMicrosoft	Medium	Dynamic Form Modeling
Shared Calendar Asked by:GoogleMicrosoftApple	Medium	Recurring Event Expansion
Excel / Spreadsheet Engine Asked by:MicrosoftGoogleApple	Hard	Dependency Graph, Cell Eval

0/2 solved

Status	Star	Problem	Difficulty	Key Focus	Notes
		Search Ranking (Learning to Rank) Asked by:GoogleMicrosoftAmazon+1 more	Hard	NDCG, Feature Engineering
		Search Engine with Trie Asked by:GoogleMicrosoftYahoo	Hard	Trie suggestions, Inverted Index, TF-IDF Strategy, Boolean Query Intersections

0/1 solved

Status	Star	Problem	Difficulty	Key Focus	Notes
		Online Judge (LeetCode-lite) Asked by:GoogleMicrosoftHackerRank	Hard	Sandbox Strategy, Observer Pattern, Thread-Safe Judge Pool, Leaderboard Aggregation

0/4 solved

Problem	Difficulty	Key Focus
Email Client Asked by:GoogleMicrosoftYahoo	Medium	Search, Folder Hierarchy
User Presence System Asked by:SlackWhatsAppMicrosoft	Medium	Heartbeat, Map State
Discord / Slack (Messaging) Asked by:DiscordSlackMeta+1 more	Hard	Session Management, Pub-Sub
Email Search Engine Asked by:GoogleMicrosoftYahoo	Hard	Inverted Index, Threading

0/1 solved

Status	Star	Problem	Difficulty	Key Focus	Notes
		Circuit Breaker Asked by:NetflixAWSGoogle+1 more	Medium	State Transitions (Open/Closed)

0/1 solved

Status	Star	Problem	Difficulty	Key Focus	Notes
		Auth Service (OAuth / SSO) Asked by:OktaMicrosoftAuth0+1 more	Hard	Token Rotation, RBAC/ABAC