#object-oriented design

Backend for a game of checkers
CodingMediumxAI
▲ 00 solutions
Resumable iterators that save and restore their position
CodingMediumOpenAIxAI
▲ 00 solutions
Thread-safe single-machine chat server with channels
CodingMediumDatabricks
▲ 00 solutions
Select table cells and set a color
CodingMediumFigma
▲ 01 solution
Inherited permissions across teams, folders and files
CodingMediumFigma
▲ 01 solution
Unix find command with pluggable filters
CodingHardGoogleAmazon
▲ 01 solution
Meeting room scheduler over a fixed set of rooms
CodingMediumAmazonUber
▲ 01 solution
Connect Four board with gravity drops and board snapshots
CodingMediumSnowflake
▲ 01 solution
Two-player card game simulation
CodingMediumAmazon
▲ 01 solution
Turn-based monster team battle simulator
CodingMediumOpenAI
▲ 01 solution
Per-user token bucket limiter with interval refills
CodingMediumxAI
▲ 01 solution
Recipe manager with ingredient search
CodingMediumAnthropicAirbnb
▲ 01 solution
Persistent key-value store with binary snapshots
CodingMediumOpenAI
▲ 01 solution
In-memory note-taking system with keyword search
CodingMediumAnthropic
▲ 01 solution
In-memory SQL table with filtering and multi-key sorting
CodingMediumOpenAIMetaAirbnbMicrosoft
▲ 01 solution
Primary and secondary circuit breakers with failover
CodingMediumDatabricks
▲ 01 solution
Extensible chat app with command bots
CodingMediumOpenAI
▲ 01 solution
Three-card showdown between two players
CodingEasyOpenAI
▲ 01 solution
Shuffle, deal and sort a four-player card hand
CodingEasyOpenAIScale AI
▲ 01 solution
Task manager with user quotas and expiring assignments
CodingMediumAnthropicAirbnb
▲ 01 solution
Rectangle board with remove-at-cell, batch remove and undo
CodingMediumOpenAI
▲ 01 solution
Design Unix file search
OO designHardAmazon
▲ 01 solution
Design tic-tac-toe
OO designEasyAmazon
▲ 01 solution
Design an elevator control system
OO designHardAmazonWaymo
▲ 01 solution
Design an ATM
OO designMediumAmazon
▲ 01 solution
Design Amazon Locker (object-oriented)
OO designMediumAmazon
▲ 01 solution
Design Amazon Kindle (object-oriented)
OO designEasyAmazon
▲ 01 solution
Design a voting system
OO designEasyAmazon
▲ 01 solution
Design a vending machine
OO designEasyAmazon
▲ 01 solution
Design a traffic light control system
OO designEasyAmazon
▲ 01 solution
Design a restaurant reservation service
OO designMediumAmazon
▲ 01 solution
Design a pizza price calculator
OO designMediumAmazon
▲ 01 solution
Design a parking lot
OO designMediumAmazonUber
▲ 01 solution
Design a library management system
OO designHardAmazon
▲ 01 solution
Design a hotel booking system (object-oriented)
OO designMediumAmazon
▲ 01 solution
Design a food delivery system (object-oriented)
OO designHardAmazon
▲ 01 solution
Design a coffee maker
OO designEasyAmazon
▲ 01 solution
Design a chess game
OO designEasyAmazon
▲ 01 solution
Design a blackjack game
OO designMediumAmazon
▲ 01 solution