Top 250 System Design Interview Questions and Answers

Design Zomato - a food delivery platform

• Zomato is a platform that connects users with restaurants for food delivery

• Users can search for restaurants, view menus, and place orders

• Restaurants can register, manage their menus, and receive orders

• Delivery ...read more

Designing a social media platform with friend requests and posts.

• Implement user profiles with friend request functionality.

• Allow users to create and share posts on their profiles.

• Include news feed to display posts from friends.

• Implement notifications...read more

Design a service to aggregate multiple sources of data/documentation centrally.

• Identify sources of data/documentation

• Determine data aggregation method

• Design a centralized database to store aggregated data

• Develop a user-friendly interface to access th...read more

Designing a highly scalable inventory management system involves utilizing distributed databases, microservices architecture, and efficient data processing techniques.

• Utilize distributed databases to handle large volumes of data and ensure high avail...read more

Design a search service for travel with relevant results.

• Utilize user input to determine search criteria (destination, dates, budget, etc.)

• Incorporate filters for specific preferences (e.g. hotel ratings, airline preferences)

• Implement algorithms to p...read more

The play store home page consists of various components that provide a user-friendly interface for browsing and discovering apps.

• Header section displaying the app logo, search bar, and navigation options

• Featured apps section showcasing popular or rec...read more

Design an online food delivery platform

• Identify target audience and their needs

• Create a user-friendly interface for ordering food

• Develop a robust backend system for managing orders and deliveries

• Partner with local restaurants to offer a wide variety ...read more

Design a multi-user job scheduler that efficiently manages and executes jobs for multiple users with priority and resource allocation.

• Define user roles: Admin, User, and Guest with varying permissions.

• Implement job types: Batch jobs, Real-time jobs, ...read more

I have not been asked any problem statements related to networking in my system design interview.

• N/A

System design components are the building blocks of a system that define its structure and functionality.

• Components include modules, interfaces, data storage, and communication protocols.

• Modules are self-contained units of functionality that can be e...read more

Design attendance management system

• Create a database to store employee information

• Implement a user interface for employees to mark their attendance

• Develop a system to track and record attendance data

• Generate reports and analytics based on attendance ...read more

Design a basic hash map

• Use an array of linked lists to handle collisions

• Implement methods for adding, removing, and retrieving key-value pairs

• Include a hashing function to map keys to indices in the array

Design and create a calculator prototype using React

• Create a component for the display screen

• Implement functions for basic arithmetic operations

• Use state to store current input and result

• Design buttons for numbers and operators

• Handle user input and u...read more

Designing a high scale Multithreaded system requires careful consideration of thread synchronization, load balancing, and resource management.

• Identify the critical sections of code that need to be synchronized

• Choose an appropriate synchronization mec...read more

Best practices for building a product in system design include defining requirements, modular design, scalability, testing, and monitoring.

• Define clear requirements and goals before starting the design process.

• Use modular design to break down the sys...read more

To deploy multiple environment scripts using Terraform, you can use Terraform workspaces and variables.

• Use Terraform workspaces to manage multiple environments such as dev, staging, and production.

• Create separate Terraform configuration files for eac...read more

The event loop is a mechanism that allows for efficient handling of multiple events in a system, while the event queue stores events waiting to be processed.

• The event loop continuously checks for events in the event queue and processes them one by on...read more

Designing Uber involves creating a scalable and efficient ride-sharing platform.

• Implement a user authentication system for drivers and passengers.

• Develop a real-time location tracking feature for drivers and passengers.

• Design a matching algorithm to ...read more

Designing an infrastructure involves planning and implementing the necessary hardware, software, networks, and services to support an organization's operations.

• Identify the requirements and goals of the infrastructure

• Select appropriate hardware and s...read more

Prevent breaking singleton pattern using reflections by throwing an exception in the private constructor.

• Throw an exception in the private constructor if an instance already exists.

• Use a flag to track if an instance has been created and throw an exce...read more

An E-Commerce system can be designed by identifying user requirements, selecting appropriate technologies, and implementing secure payment and shipping methods.

• Identify user requirements and create user stories

• Select appropriate technologies for fron...read more

Singleton Design pattern ensures a class has only one instance and provides a global point of access to it.

• Ensure the class has a private static instance variable.

• Provide a public static method to access the instance.

• Make the constructor private to p...read more

Yes, I can design a website similar to Amazon by focusing on user-friendly interface, robust search functionality, secure payment options, and personalized recommendations.

• Focus on user-friendly interface with easy navigation

• Implement robust search f...read more

Discussing the low-level design of a system similar to Flipkart

• Divide the system into modules like user authentication, product catalog, shopping cart, payment gateway

• Discuss the data flow between these modules and how they interact with each other

• Ex...read more

Design a system using image recognition technology

• Utilize deep learning algorithms for image recognition

• Collect and label a large dataset of images for training

• Implement a convolutional neural network (CNN) for image classification

• Use transfer learni...read more

Database design for a ticket booking system like BookMyShow involves tables for users, events, bookings, and venues.

• Create a table for users with columns like user_id, name, email, phone_number, etc.

• Create a table for events with columns like event_i...read more

Designing an ATM machine involves considering user interface, security measures, transaction processing, and hardware components.

• User interface should be intuitive and easy to navigate for users of all ages.

• Implement security measures such as PIN ent...read more