Low-Level Design

Object-oriented / low-level design of a focused module.

Adobe
Design a logging library with levels and sinks.
BackendStaff+Medium◆ Commonly asked
#oop
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Adobe
Design a toast/notification manager API.
FrontendMidMedium◆ Commonly asked
#oop#pub-sub
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Adobe
Design a form-state library with validation rules.
Full-stackMidMedium◆ Commonly asked
#oop#api-design
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Affirm
Design a client-side event bus / pub-sub.
FrontendMidMedium◆ Commonly asked
#pub-sub#oop
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Affirm
Design an in-memory file system.
Full-stackMidHard◆ Commonly asked
#oop#trees
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Affirm
Design a data-fetching cache with invalidation.
FrontendStaff+Hard◆ Commonly asked
#cache#oop
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Affirm
Design a chess game (pieces, moves, board).
Full-stackStaff+Hard◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Airbnb
Design a data-fetching cache with invalidation.
FrontendMidHard◆ Commonly asked
#cache#oop
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Airbnb
Design a logging library with levels and sinks.
Full-stackMidMedium◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Airbnb
Design a toast/notification manager API.
FrontendStaff+Medium◆ Commonly asked
#oop#pub-sub
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Airtable
Model the state machine for a checkout flow.
FrontendMidMedium◆ Commonly asked
#state-machine
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Airtable
Design an in-memory file system.
Full-stackMidHard◆ Commonly asked
#oop#trees
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Airtable
Design the component model for a rich text editor.
FrontendStaff+Hard◆ Commonly asked
#oop#editor
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Amazon
Design a virtual DOM diffing model.
FrontendStaff+Hard◆ Commonly asked
#oop#algorithms
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Amazon
Design a ride-hailing dispatch model (classes).
Full-stackStaff+Hard◆ Commonly asked
#oop#matching
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Amazon
Design a library management system.
BackendMidMedium◆ Commonly asked
#oop
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Anthropic
Design a chess game (pieces, moves, board).
BackendMidHard◆ Commonly asked
#oop
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Anthropic
Design a ride-hailing dispatch model (classes).
BackendStaff+Hard◆ Commonly asked
#oop#matching
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Apple
Design a logging library with levels and sinks.
Full-stackMidMedium◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Apple
Design an analytics event-tracking client.
FrontendStaff+Medium◆ Commonly asked
#oop#observability
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Apple
Design a movie-ticket booking system (BookMyShow).
Full-stackStaff+Hard◆ Commonly asked
#oop#concurrency
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Asana
Design a logging library with levels and sinks.
BackendStaff+Medium◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Asana
Design a reusable form-validation library API.
FrontendMidMedium◆ Commonly asked
#oop#api-design
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Asana
Design a client-side event bus / pub-sub.
Full-stackMidMedium◆ Commonly asked
#pub-sub#oop
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Atlassian
Design a vending machine.
BackendStaff+Easy◆ Commonly asked
#oop#state-machine
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Block
Design a virtual DOM diffing model.
FrontendMidHard◆ Commonly asked
#oop#algorithms
PracticeGeeksforGeeks Search
Block
Design a logging library with levels and sinks.
Full-stackMidMedium◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Brex
Design a design-token theming system.
FrontendStaff+Medium◆ Commonly asked
#design-system
PracticeGeeksforGeeks Search
Brex
Design a form-state library with validation rules.
Full-stackStaff+Medium◆ Commonly asked
#oop#api-design
PracticeGeeksforGeeks Search
Brex
Design a booking/reservation system core.
BackendMidMedium◆ Commonly asked
#oop#concurrency
PracticeGeeksforGeeks Search
ByteDance
Design a reusable form-validation library API.
FrontendStaff+Medium◆ Commonly asked
#oop#api-design
PracticeGeeksforGeeks Search
ByteDance
Design a data-fetching cache with invalidation.
Full-stackStaff+Hard◆ Commonly asked
#cache#oop
PracticeGeeksforGeeks Search
ByteDance
Design a deck of cards + a card game.
BackendMidEasy◆ Commonly asked
#oop
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Canva
Design a toast/notification manager API.
FrontendMidMedium◆ Commonly asked
#oop#pub-sub
PracticeGeeksforGeeks Search
Canva
Design a vending machine.
Full-stackMidEasy◆ Commonly asked
#oop#state-machine
PracticeGeeksforGeeks Search
Canva
Design a form-state library with validation rules.
FrontendStaff+Medium◆ Commonly asked
#oop#api-design
PracticeGeeksforGeeks Search
Canva
Design an ATM / cash dispenser.
Full-stackStaff+Medium◆ Commonly asked
#oop#state-machine
PracticeGeeksforGeeks Search
Carta
Design a design-token theming system.
FrontendMidMedium◆ Commonly asked
#design-system
PracticeGeeksforGeeks Search
Carta
Design an elevator control system.
Full-stackMidMedium◆ Commonly asked
#oop#state-machine
PracticeGeeksforGeeks Search
Chime
Design a toast/notification manager API.
FrontendMidMedium◆ Commonly asked
#oop#pub-sub
PracticeGeeksforGeeks Search
Chime
Design classes for a parking lot.
Full-stackMidMedium◆ Commonly asked
#oop#design-patterns
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Chime
Design an analytics event-tracking client.
FrontendStaff+Medium◆ Commonly asked
#oop#observability
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Cisco
Design a client-side router.
FrontendMidMedium◆ Commonly asked
#oop#routing
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Cisco
Design a design-token theming system.
Full-stackMidMedium◆ Commonly asked
#design-system
PracticeGeeksforGeeks Search
Cisco
Design an analytics event-tracking client.
FrontendStaff+Medium◆ Commonly asked
#oop#observability
PracticeGeeksforGeeks Search
Cisco
Design a movie-ticket booking system (BookMyShow).
Full-stackStaff+Hard◆ Commonly asked
#oop#concurrency
PracticeGeeksforGeeks Search
Cloudflare
Design a reusable form-validation library API.
FrontendMidMedium◆ Commonly asked
#oop#api-design
PracticeGeeksforGeeks Search
Cloudflare
Design a design-token theming system.
Full-stackMidMedium◆ Commonly asked
#design-system
PracticeGeeksforGeeks Search
Cloudflare
Design the component model for a rich text editor.
FrontendStaff+Hard◆ Commonly asked
#oop#editor
PracticeGeeksforGeeks Search
Cloudflare
Design a virtual DOM diffing model.
Full-stackStaff+Hard◆ Commonly asked
#oop#algorithms
PracticeGeeksforGeeks Search
Coinbase
Design an elevator control system.
BackendStaff+Medium◆ Commonly asked
#oop#state-machine
PracticeGeeksforGeeks Search
Confluent
Design a library management system.
BackendStaff+Medium◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Confluent
Design a form-state library with validation rules.
FrontendMidMedium◆ Commonly asked
#oop#api-design
PracticeGeeksforGeeks Search
Confluent
Design an ATM / cash dispenser.
Full-stackMidMedium◆ Commonly asked
#oop#state-machine
PracticeGeeksforGeeks Search
Coursera
Design a deck of cards + a card game.
BackendStaff+Easy◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Coursera
Design a data-fetching cache with invalidation.
FrontendMidHard◆ Commonly asked
#cache#oop
PracticeGeeksforGeeks Search
Coursera
Design a design-token theming system.
Full-stackMidMedium◆ Commonly asked
#design-system
PracticeGeeksforGeeks Search
Cruise
Design an ATM / cash dispenser.
BackendMidMedium◆ Commonly asked
#oop#state-machine
PracticeGeeksforGeeks Search
Cruise
Design a logging library with levels and sinks.
BackendStaff+Medium◆ Commonly asked
#oop
PracticeGeeksforGeeks Search
Databricks
Design a hotel-reservation system core.
Full-stackStaff+Medium◆ Commonly asked
#oop#concurrency
PracticeGeeksforGeeks Search

More practice · open source

Topic banks

46extra questions on this round's topics, imported from MIT-licensed open-source repositories. These are topic questions — they are not attributed to any company.

Design Patterns46 questions

What are the main categories of Design Patterns?
What is a pattern?
What is Singleton pattern?
What is Design Patterns and why anyone should use them?
What is Factory pattern?
What is Iterator pattern?
What is Inversion of Control?
Can we create a clone of a singleton object?
Name types of Design Patterns?
What is Template pattern?
What is Filter pattern?
What is Strategy pattern?
What is Dependency Injection?
What is Null Object pattern?
What is State pattern?
What is Proxy pattern?
What is Builder pattern?
What are the difference between a static class and a singleton class?
When should I use composite design pattern?
What does “program to interfaces, not implementations” mean?
What is Abstract Factory pattern?
What is Decorator pattern?
What is Prototype pattern?
What is Memento pattern?
Can you give any good explanation what is the difference between Proxy and Decorator?
What is Adapter Pattern?
What is Bridge pattern?
What is the Chain of Responsibility pattern?
What is Observer pattern?
What is Command pattern?
What is Interpreter pattern?
What is Facade pattern?
What is Mediator pattern?
When would you use the Builder Pattern? Why not just use a Factory Pattern?
Why would I ever use a Chain of Responsibility over a Decorator?
What is Flyweight pattern?
Explain usage of Service Locator Pattern
What is the difference between Strategy design pattern and State design pattern?
How is Bridge pattern is different from Adapter pattern?
Explain what is Composition over inheritance?
Could you explain the difference between Façade vs. Mediator?
Explain difference between the Facade, Proxy, Adapter and Decorator design patterns?
What is the difference between the template patterns and the strategy pattern?
What's the difference between the Dependency Injection and Service Locator patterns?
Could you explain what is the "deadly diamond of death"?
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