Low-Level Design

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

1Password
Design a booking/reservation system core.
BackendMidMedium◆ Commonly asked
#oop#concurrency
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1Password
Design a movie-ticket booking system (BookMyShow).
BackendStaff+Hard◆ Commonly asked
#oop#concurrency
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Abridge
Design a client-side event bus / pub-sub.
Full-stackMidMedium◆ Commonly asked
#pub-sub#oop
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Abridge
Model the state machine for a checkout flow.
FrontendStaff+Medium◆ Commonly asked
#state-machine
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Abridge
Design a logging library with levels and sinks.
Full-stackStaff+Medium◆ Commonly asked
#oop
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Acko
Design a client-side event bus / pub-sub.
FrontendMidMedium◆ Commonly asked
#pub-sub#oop
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Acko
Design a vending machine.
Full-stackMidEasy◆ Commonly asked
#oop#state-machine
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Acko
Design a form-state library with validation rules.
FrontendStaff+Medium◆ Commonly asked
#oop#api-design
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Activision Blizzard
Design an undo/redo stack for an editor.
FrontendMidMedium◆ Commonly asked
#oop#command
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Activision Blizzard
Design a vending machine.
Full-stackMidEasy◆ Commonly asked
#oop#state-machine
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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
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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
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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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Airtel
Design a form-state library with validation rules.
FrontendStaff+Medium◆ Commonly asked
#oop#api-design
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Airtel
Design a drag-and-drop framework abstraction.
Full-stackStaff+Hard◆ Commonly asked
#oop#dnd
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Airtel
Design a booking/reservation system core.
BackendMidMedium◆ Commonly asked
#oop#concurrency
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Akamai
Design the component model for a rich text editor.
FrontendStaff+Hard◆ Commonly asked
#oop#editor
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Akamai
Design a reusable form-validation library API.
Full-stackStaff+Medium◆ Commonly asked
#oop#api-design
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Akamai
Design a movie-ticket booking system (BookMyShow).
BackendMidHard◆ Commonly asked
#oop#concurrency
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Algolia
Design a hotel-reservation system core.
BackendStaff+Medium◆ Commonly asked
#oop#concurrency
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Algolia
Design a drag-and-drop framework abstraction.
FrontendMidHard◆ Commonly asked
#oop#dnd
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Algolia
Design an elevator control system.
Full-stackMidMedium◆ Commonly asked
#oop#state-machine
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Alibaba
Design a food-delivery order/dispatch model.
BackendMidHard◆ Commonly asked
#oop#state-machine
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Alibaba
Design a booking/reservation system core.
BackendStaff+Medium◆ Commonly asked
#oop#concurrency
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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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AMD
Design a hotel-reservation system core.
BackendMidMedium◆ Commonly asked
#oop#concurrency
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AMD
Design a notification service (channels + templates).
BackendStaff+Medium◆ Commonly asked
#oop
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American Express
Design a logging library with levels and sinks.
BackendStaff+Medium◆ Commonly asked
#oop
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American Express
Design the component model for a rich text editor.
FrontendMidHard◆ Commonly asked
#oop#editor
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American Express
Design a toast/notification manager API.
Full-stackMidMedium◆ Commonly asked
#oop#pub-sub
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Amplitude
Design classes for a parking lot.
BackendMidMedium◆ Commonly asked
#oop#design-patterns
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Amplitude
Design a vending machine.
BackendStaff+Easy◆ Commonly asked
#oop#state-machine
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Analog Devices
Design a form-state library with validation rules.
Full-stackStaff+Medium◆ Commonly asked
#oop#api-design
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Analog Devices
Design a vending machine.
BackendMidEasy◆ Commonly asked
#oop#state-machine
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Anduril
Design a drag-and-drop framework abstraction.
FrontendStaff+Hard◆ Commonly asked
#oop#dnd
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Anduril
Design a notification service (channels + templates).
Full-stackStaff+Medium◆ Commonly asked
#oop
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Anduril
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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Anyscale
Design a notification service (channels + templates).
BackendStaff+Medium◆ Commonly asked
#oop
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Anyscale
Model the state machine for a checkout flow.
FrontendMidMedium◆ Commonly asked
#state-machine
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Apple
Design a logging library with levels and sinks.
Full-stackMidMedium◆ Commonly asked
#oop
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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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Applied Intuition
Design a booking/reservation system core.
BackendMidMedium◆ Commonly asked
#oop#concurrency
PracticeGeeksforGeeks Search
Applied Intuition
Design a movie-ticket booking system (BookMyShow).
BackendStaff+Hard◆ Commonly asked
#oop#concurrency
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Applied Materials
Design an undo/redo stack for an editor.
FrontendStaff+Medium◆ Commonly asked
#oop#command
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Applied Materials
Design a keyboard-shortcut registry.
Full-stackStaff+Medium◆ Commonly asked
#oop
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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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