Top 250 System Design Interview Questions and Answers
Updated 12 Dec 2024
Q101. Design a flash sale kind of a system
A flash sale system is designed to offer limited-time discounts on products or services to create urgency and drive sales.
Create a platform where customers can browse and purchase discounted products or services within a specified time frame
Implement a countdown timer to create a sense of urgency
Ensure a limited quantity of items available to increase demand
Notify customers about upcoming flash sales through email or push notifications
Implement a secure payment gateway to fac...read more
Q102. design a LLD of portfolio management system where you can add any stock to your portfolio sell any stock. calculate % return on your port folio. list your portfolio which is stocks with current prices and retur...
read moreDesign a portfolio management system to add and sell stocks, calculate returns, and display current prices and returns.
Create a class for the portfolio with methods to add and sell stocks
Implement a method to calculate the percentage return on the portfolio
Maintain a list of stocks in the portfolio with their current prices and returns
Use arrays or lists to store the portfolio data
Ensure proper error handling for invalid inputs or insufficient data
Q103. Design movie ticket system
Design a movie ticket system
Create a database to store movie details, showtimes, and seat availability
Implement a user interface for customers to select movies, seats, and purchase tickets
Develop a ticketing algorithm to handle seat reservations and prevent double bookings
Include features like seat selection, payment processing, and ticket confirmation
Consider scalability and performance for handling high traffic during peak times
Q104. What is HLD design? How to receive input from client
HLD design stands for High Level Design, it is a design document that describes the overall system architecture and design.
HLD design outlines the structure of the system, including components, modules, interfaces, and data for the system.
It focuses on the overall system design rather than detailed design of individual components.
To receive input from the client for HLD design, conduct meetings, interviews, surveys, and workshops to gather requirements and preferences.
Client ...read more
Q105. Design high volume data intensive applications
Designing high volume data intensive applications involves optimizing data storage, retrieval, and processing for large amounts of data.
Utilize distributed computing frameworks like Hadoop or Spark for processing large datasets
Implement data partitioning and sharding to distribute data across multiple servers for scalability
Use caching mechanisms to reduce latency in data retrieval
Optimize database queries and indexes for efficient data retrieval
Consider using NoSQL databases...read more
Q106. Design Uber like car sharing system
Design a car sharing system similar to Uber
Create a mobile app for users to request rides
Implement a driver app for accepting rides
Include a rating system for both drivers and passengers
Integrate a payment system for seamless transactions
Q107. Design a system for a company in hospitality
Design a system for a company in hospitality
Implement a centralized reservation system for booking rooms, tables, and other services
Incorporate a customer feedback system to gather reviews and ratings for continuous improvement
Include a staff scheduling and management module to efficiently allocate resources
Integrate a payment gateway for secure transactions and invoicing
Utilize data analytics to track customer preferences and trends for personalized experiences
Q108. Design a recommendation system which can help in developer ranking for jobs
Develop a recommendation system for ranking developers for job positions.
Collect data on developer skills, experience, projects, and job preferences
Use collaborative filtering to recommend job positions based on similar developers
Implement content-based filtering to recommend jobs based on developer skills and preferences
Utilize machine learning algorithms to continuously improve recommendations
Consider incorporating feedback from developers and employers to enhance the syste...read more
System Design Jobs
Q109. Design Parking Management System
Design a Parking Management System for efficient parking space allocation and management.
Implement a system to track available parking spaces in real-time.
Include features for booking parking spots in advance.
Incorporate a payment system for parking fees.
Utilize sensors or cameras for monitoring parking space occupancy.
Develop a user-friendly interface for customers to easily navigate and use the system.
Design and develop and todo list type of application using localstorage.
A todo list application using localstorage.
Use HTML, CSS, and JavaScript to create the user interface.
Use the localstorage API to store and retrieve todo items.
Implement features like adding, editing, and deleting todo items.
Display the list of todo items and their status.
Allow users to mark todo items as completed or incomplete.
Q111. Explain database normalization. Draw a high-level design of a system including firewalls, servers, etc. on a whiteboard.
Database normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
Database normalization involves breaking down a database into smaller, more manageable tables to reduce redundancy.
It helps in minimizing data anomalies and ensures data integrity.
Normalization is achieved through a series of rules called normal forms, such as 1NF, 2NF, 3NF, and BCNF.
For example, in a database of customers and orders, instead of storing custo...read more
Q112. Design a voting system for a university
Design a voting system for a university
Identify the type of voting system required (e.g. electronic, paper-based)
Determine the scope of the voting system (e.g. student council elections, faculty senate votes)
Establish eligibility criteria for voters and candidates
Create a secure and anonymous voting process
Implement a system for vote counting and result reporting
Q113. What is Design challenges in operation
Design challenges in operations involve optimizing processes, managing resources efficiently, and ensuring smooth workflow.
Balancing cost and quality in operations
Implementing new technologies while minimizing disruptions
Ensuring compliance with regulations and standards
Managing risks and uncertainties in operations
Improving communication and coordination among teams
Optimizing supply chain management
Enhancing productivity and efficiency
Q114. System Design Round2: Design a system similar to Zookeeper
Design a system similar to Zookeeper for managing distributed systems
Use a centralized service for maintaining configuration information, naming, and providing distributed synchronization
Implement a hierarchical namespace similar to file system paths for organizing data
Utilize a consensus algorithm like Paxos or Raft for ensuring consistency and fault tolerance
Q115. Design the ImageDownloader, with efficiently handling parallel API calls.
ImageDownloader efficiently handles parallel API calls.
Use a thread pool to manage parallel API calls.
Implement caching to avoid redundant API calls.
Use a priority queue to prioritize image downloads.
Optimize network requests by using HTTP/2 or multiplexing.
Consider using a library like Picasso or Glide for image loading and caching.
Q116. Design Twitter
Design Twitter - a social media platform for microblogging and sharing thoughts in real-time.
Users can create profiles and follow other users
Users can post tweets (limited to 280 characters)
Tweets can include hashtags and mentions
Users can like, retweet, and reply to tweets
Twitter can use algorithms to curate content for users
Twitter can also offer advertising options for businesses
Q117. Design a monitoring system
Design a monitoring system for SiteOps
Identify key metrics to monitor such as server uptime, response time, and error rates
Implement monitoring tools like Nagios, Zabbix, or Prometheus to track these metrics
Set up alerts for critical thresholds to notify the team in case of issues
Create dashboards to visualize the data and trends for easy monitoring
Regularly review and update the monitoring system to ensure it remains effective
Q118. How do you achieve high availability and zero downtime with any idm system
Achieving high availability and zero downtime with an IDM system involves redundancy, load balancing, disaster recovery planning, and continuous monitoring.
Implementing redundancy by having multiple servers for failover
Utilizing load balancing to distribute traffic evenly across servers
Creating a disaster recovery plan to quickly recover from any failures
Continuous monitoring of system performance and availability
Regularly testing failover and disaster recovery procedures
Q119. Design online coding judge.
Online coding judge to evaluate code submissions and provide feedback.
Create a web application where users can submit code in various programming languages.
Implement a compiler or interpreter to execute the code and check for errors.
Provide feedback on code correctness, efficiency, and style.
Include test cases to verify the code's functionality.
Allow users to view their submission history and track their progress.
Q120. Design a system for streaming data
Design a system for streaming data
Use a distributed system architecture to handle high volume of data
Implement a message queue system like Kafka or RabbitMQ for real-time data processing
Utilize microservices for scalability and fault tolerance
Consider using a data lake for storing and analyzing large amounts of streaming data
Q121. Design a simple system to show bus routes and arrival time
A system to display bus routes and arrival times
Create a database of bus routes with stops and timings
Develop a user interface to search for routes and view arrival times
Integrate real-time GPS data for accurate arrival times
Q122. Design auth service
Designing an authentication service for software development.
Use secure protocols like OAuth or JWT for authentication
Implement multi-factor authentication for added security
Store user credentials securely using encryption
Implement rate limiting and IP blocking to prevent brute force attacks
Q123. Design a ridesharing service
A ridesharing service connecting drivers with passengers for convenient and affordable transportation.
Allow users to request rides through a mobile app
Match drivers with passengers based on location and destination
Provide estimated arrival times and fare estimates
Implement a rating system for drivers and passengers
Offer options for shared rides to reduce costs
Q124. How would you design tiny url implementation?
Design a system to create and manage short URLs for long URLs.
Use a database to store mappings of short URLs to long URLs.
Generate a unique short URL for each long URL using a hashing algorithm.
Implement a redirect service to redirect users from short URLs to long URLs.
Consider adding expiration dates for short URLs to manage storage.
Implement analytics to track usage of short URLs.
Q125. design a data pipeline for e-commerce website.
Design a data pipeline for an e-commerce website.
Extract data from website databases, such as product information, customer details, and order history.
Transform the data by cleaning, filtering, and aggregating it to make it usable for analysis.
Load the processed data into a data warehouse or data lake for storage and further analysis.
Implement data pipelines using tools like Apache Kafka, Apache Spark, or AWS Glue.
Monitor the data pipeline for errors and performance issues to...read more
Q126. Explain your architecture proposal low level design
The low level design of my architecture proposal focuses on detailed components and interactions.
Detailed breakdown of system components and their interactions
Specific technologies and tools used for implementation
Data flow diagrams and sequence diagrams for each component
Error handling and recovery mechanisms
Scalability and performance considerations
Q127. design payments infrastructure
Designing a robust and scalable payments infrastructure for efficient transactions.
Identify the requirements of the payments system, including transaction volume, security, and integration with existing systems.
Choose appropriate payment methods such as credit/debit cards, digital wallets, and bank transfers.
Implement secure payment gateways to process transactions securely and efficiently.
Consider compliance with regulations such as PCI DSS for handling payment card data.
Ens...read more
Q128. Design netflix otp system
Design a Netflix OTP system.
Use a secure algorithm to generate OTPs.
Implement a time-based OTP system.
Integrate with a reliable SMS gateway for OTP delivery.
Implement rate limiting to prevent brute force attacks.
Provide an option for users to disable OTP for trusted devices.
Ensure compliance with data privacy regulations.
Q129. design email notification system
Design an email notification system for efficient communication.
Identify the triggers for sending email notifications (e.g. new user registration, password reset)
Design a user-friendly interface for users to manage their notification preferences
Implement a system to track email delivery and user engagement
Consider personalization options for email content based on user behavior
Ensure compliance with data protection regulations (e.g. GDPR)
Q130. Design a system that can plug in new adapters with minimal code changes
Use a plugin architecture with interfaces and dependency injection to easily add new adapters
Implement a plugin architecture where each adapter is a separate plugin
Define interfaces for adapters to ensure consistency in implementation
Use dependency injection to dynamically load and use adapters
Utilize configuration files to specify which adapters to load
Ensure proper error handling and logging for easy troubleshooting
Q131. Design a system for large file processing
Utilize distributed computing and parallel processing to handle large file processing efficiently
Use distributed file systems like Hadoop Distributed File System (HDFS) to store and process large files
Leverage parallel processing frameworks like Apache Spark or Apache Flink to process files in parallel
Implement data partitioning and shuffling techniques to distribute workload evenly across nodes
Utilize batch processing or stream processing based on the nature of the files bei...read more
Q132. Design a async system to send notification to users
Design an async system to send notifications to users
Use a message queue system like RabbitMQ or Kafka to handle asynchronous communication
Implement a notification service that processes and sends notifications based on user preferences
Utilize push notifications for mobile devices and email notifications for desktop users
Include error handling and retry mechanisms to ensure delivery of notifications
Q133. Design a system similar to BookMyShow
Design a system similar to BookMyShow for booking tickets for events and movies.
User registration and login system
Event and movie listing with details and show timings
Seat selection and booking process
Payment gateway integration
Booking history and ticket download option
Q134. Design Netflix streaming system
Design a scalable and efficient streaming system for Netflix.
Use a content delivery network (CDN) to cache and deliver content closer to users.
Implement a recommendation system to personalize content for users.
Utilize a microservices architecture to handle different components like user authentication, video encoding, and streaming.
Use load balancing and auto-scaling to handle varying traffic demands.
Implement a fault-tolerant system to ensure continuous streaming even in cas...read more
Q135. Design a booking system
A booking system for scheduling appointments or reservations
Allow users to select date and time for booking
Include user registration and login functionality
Send confirmation emails or notifications to users
Implement a calendar view for easy scheduling
Include payment processing for reservations if applicable
Q136. System design. Design a 2-player virtual reality game hosted in 2 different geographic location.
Design a 2-player virtual reality game hosted in 2 different geographic locations.
Utilize a network connection to enable real-time communication between players
Implement a shared virtual environment where players can interact and compete
Include features like voice chat, hand gestures, and avatar customization
Ensure low latency and high bandwidth to provide a seamless gaming experience
Q137. Design Ad service
Design an Ad service for displaying advertisements to users based on their preferences and behavior.
Implement a recommendation system to suggest relevant ads to users.
Utilize user data such as browsing history, search queries, and demographic information to personalize ads.
Allow users to opt out of personalized ads and provide transparency on data usage.
Track ad performance metrics like click-through rates and conversions to optimize ad targeting.
Consider implementing ad targ...read more
Q138. Design a chat system
Design a chat system for real-time communication
Use WebSocket for real-time communication
Implement user authentication and authorization
Store chat messages in a database for persistence
Support features like group chat, file sharing, and message encryption
Q139. Create LLD Design for Movie Ticket Booking System(BookMyShow.com)
LLD Design for Movie Ticket Booking System(BookMyShow.com)
Use case diagram to identify actors and their interactions
Class diagram to represent entities like User, Movie, Theater, Booking
Sequence diagram to show the flow of events during ticket booking process
Q140. Which works when? Refer alexxu system design book
The question is about understanding the timing and order of operations in a system.
Understanding the sequence of events in a system is crucial for ensuring proper functionality.
Timing considerations include when data is processed, when actions are triggered, and when resources are allocated.
Examples include knowing when to update a database record after receiving user input, or when to send a notification after a certain event occurs.
Q141. Design a system that provides insights from a customer service chat dump
Design a system to extract insights from customer service chat data
Implement natural language processing (NLP) techniques to analyze text data
Use sentiment analysis to understand customer emotions and satisfaction levels
Identify frequently asked questions or common issues to improve customer service
Create visualizations to present key insights and trends to stakeholders
Q142. Design a food ordering system like Swiggy
A food ordering system like Swiggy allows users to browse restaurants, place orders, track delivery, and make payments online.
User registration and login functionality
Restaurant listing with menu and prices
Cart management for adding/removing items
Order tracking and status updates
Payment gateway integration
Delivery tracking with real-time updates
Q143. Design Zomato Ordering System
Design a Zomato Ordering System for online food delivery.
Allow users to browse restaurants and menus
Implement user authentication and profile management
Enable users to place orders and make payments online
Include features like order tracking and ratings/reviews
Integrate with restaurant partners for order fulfillment
Q144. Design live streaming
Designing live streaming for an IOS app
Use a reliable streaming service like Wowza or AWS Elemental
Implement real-time video encoding and decoding
Ensure low latency for live interactions
Include features like chat, reactions, and notifications
Optimize for different network conditions and device capabilities
Q145. Design dropbox for million of users
Design scalable architecture for file storage and sharing for millions of users
Use distributed storage system like AWS S3 or Google Cloud Storage
Implement sharding to distribute load across multiple servers
Use CDN for faster file access and delivery
Implement strong encryption for data security
Use efficient indexing and caching mechanisms for quick file retrieval
Q146. Design Cab Booking System
Design a cab booking system for users to book rides with drivers.
Create a database to store user information, driver information, and ride details.
Implement a user interface for users to book rides, view ride history, and track ongoing rides.
Develop algorithms for matching users with available drivers based on location and availability.
Include features like fare estimation, real-time tracking, and payment options.
Ensure security measures for user data and transactions.
Conside...read more
Q147. Design Online Hotel Booking System
Design an online hotel booking system
User-friendly interface for searching and booking hotels
Secure payment gateway integration
Ability to filter search results based on price, location, amenities, etc.
Real-time availability updates
Confirmation emails and booking details
User reviews and ratings for hotels
Integration with mapping services for location details
Q148. Design a throttling service
A throttling service limits the number of requests a user can make to a system within a specific time frame.
Implement rate limiting based on user or IP address
Use tokens or API keys to track usage
Set limits on the number of requests allowed per minute/hour/day
Return appropriate error responses when limits are exceeded
Q149. How do you do capacity estimation?
Capacity estimation involves analyzing current resources, future demands, and potential constraints to determine the maximum workload a system can handle.
Evaluate current resources such as hardware, software, and human capital.
Analyze historical data on workload patterns and trends.
Consider potential constraints such as budget limitations or technological limitations.
Forecast future demands based on growth projections or new project requirements.
Use mathematical models or sim...read more
Q150. How would you design BCDR solution for your data center?
Designing a BCDR solution involves creating a plan to ensure business continuity and disaster recovery for the data center.
Identify critical systems and data that need to be protected
Implement redundant infrastructure for failover and high availability
Regularly test and update the BCDR plan to ensure effectiveness
Consider offsite backups and data replication for additional protection
Q151. Design a URL-shortening service
Design a URL-shortening service
Generate a unique short code for each URL
Store the mapping of short code to original URL in a database
Redirect users from short URL to original URL
Consider implementing custom short links for users
Track analytics for shortened URLs
Q152. Draw micro arch for given problem
Design a micro arch for a given problem
Identify the specific problem that the micro arch needs to solve
Consider the size and scale of the micro arch in relation to the problem
Design the structure of the micro arch to efficiently address the problem
Ensure that the materials used are suitable for the intended purpose
Q153. Design a distributed file storage system
Design a distributed file storage system
Use a distributed architecture with multiple nodes for storing files
Implement data replication for fault tolerance
Utilize a distributed consensus algorithm like Raft or Paxos for coordination
Include a metadata service for tracking file locations and versions
Q154. Design a solution so that we can have all email receive at one place
Set up email forwarding to consolidate all emails in one inbox
Set up email forwarding from all individual email accounts to one central email address
Use email filters to organize incoming emails based on sender or subject
Consider using a third-party email management tool to streamline the process
Q155. Design Cron job scheduler
Design a Cron job scheduler for automating tasks at specific times.
Define the schedule using cron expressions (e.g. '0 0 * * *' for daily at midnight)
Implement a job queue to manage tasks and their execution
Include error handling and logging for monitoring and troubleshooting
Consider scalability and performance optimizations for handling large number of jobs
Q156. Design a web crawler system
Design a web crawler system to gather information from websites
Identify the websites to crawl and the specific information to extract
Implement a system to crawl the websites and extract the desired information
Store the extracted data in a database for further analysis
Consider scalability and efficiency in the design of the web crawler system
Q157. Design sliding window rate limiter
A sliding window rate limiter limits the rate of incoming requests within a sliding time window.
Define a time window and a maximum number of requests allowed within that window
Track the number of requests received within the window using a data structure like a queue or circular buffer
Reject requests that exceed the maximum allowed within the window
Slide the window forward as time passes, removing requests that fall outside the window and adding new requests
Consider using a t...read more
Q158. design a logging system for 1000 hosts
Design a scalable logging system for 1000 hosts.
Use a centralized logging server to collect logs from all hosts.
Implement log rotation to manage disk space efficiently.
Consider using a distributed logging system like Elasticsearch, Logstash, and Kibana (ELK stack).
Q159. Design High Level Design for Instagram. (Subset of instagram features is in scope)
Design a high level design for a subset of Instagram features.
User authentication and profile creation
Photo and video uploading with filters
News feed displaying posts from followed users
Like, comment, and share functionality
Direct messaging between users
Q160. Design an analytics system
Designing an analytics system for data analysis and visualization
Define the goals and objectives of the analytics system
Identify the data sources and types of data to be collected
Choose appropriate tools and technologies for data processing and analysis
Design a data model and architecture for storing and accessing data
Implement data visualization techniques for presenting insights to users
Q161. Design a front end logging system
Design a front end logging system for tracking user actions and errors.
Implement a client-side logging library to capture user interactions and errors.
Include different log levels (e.g. info, warning, error) for better categorization.
Utilize browser's console API or custom API endpoints to send logs to server for storage and analysis.
Consider adding timestamps, user IDs, and other relevant metadata to each log entry.
Provide a user-friendly interface for developers to view and...read more
Q162. How would you approach a scheduler service at scale
I would approach a scheduler service at scale by implementing a distributed system architecture with load balancing and fault tolerance.
Implement a distributed system architecture to handle the increased load and ensure scalability
Utilize load balancing techniques to evenly distribute tasks among multiple servers
Implement fault tolerance mechanisms to ensure high availability and reliability
Monitor performance metrics and adjust resources dynamically to optimize efficiency
Con...read more
Q163. What is an HIgh availability architecture?
High availability architecture ensures systems are always operational, minimizing downtime and ensuring reliability.
Utilizes redundancy to ensure no single point of failure
Includes load balancing to distribute traffic evenly
Incorporates failover mechanisms to switch to backup systems seamlessly
Uses monitoring and alerting to quickly identify and address issues
Examples: Amazon Web Services (AWS) Auto Scaling, Google Cloud Platform (GCP) Load Balancing
Q164. Design a write ahead logger
Design a write ahead logger
Choose a storage medium (file, database, etc.)
Implement a buffer to store log entries before writing to storage
Ensure atomicity of write operations to prevent data corruption
Include timestamp and transaction ID in log entries
Implement a mechanism to recover from crashes or failures
Q165. Design your current system
Current system is a web-based application for managing customer data and orders.
Frontend built with React for user interface
Backend built with Node.js and Express for server-side logic
Database using MySQL for storing customer data and orders
Authentication using JWT tokens for secure access
Q166. Design Airplane Booking System
Design a system for booking airplane tickets efficiently and securely.
Create a user-friendly interface for customers to search and book flights.
Implement a secure payment system for processing transactions.
Include features for managing flight schedules, seat availability, and pricing.
Integrate with airlines' reservation systems for real-time updates.
Provide options for seat selection, meal preferences, and special requests.
Generate e-tickets and send confirmation emails to cu...read more
Q167. Design Video Streaming service like Netflix
Design a video streaming service similar to Netflix
Utilize a content delivery network (CDN) for efficient video streaming
Implement recommendation algorithms based on user preferences and viewing history
Include a user-friendly interface with personalized profiles and watchlists
Ensure secure payment processing and user data protection
Offer offline viewing options for subscribers on mobile devices
Q168. What parameters you will consider while design a system
Parameters considered while designing a system
Functional requirements
Performance requirements
Scalability
Security
Maintainability
Cost
User experience
Integration with existing systems
Q169. What new innovative implementation will you do to the existing system.
I would implement a machine learning algorithm to optimize the system's performance and efficiency.
Implementing a recommendation system to suggest personalized content to users based on their preferences and behavior.
Integrating natural language processing to improve the system's ability to understand and respond to user queries.
Utilizing predictive analytics to forecast future trends and make data-driven decisions for the system.
Introducing automated testing and deployment p...read more
Q170. How would you design Uber for blind
Designing Uber for blind would involve implementing features like voice-guided navigation, tactile feedback, and accessible interfaces.
Implement voice-guided navigation to provide step-by-step directions to the blind user.
Include tactile feedback in the app to help users locate their ride or confirm their location.
Design accessible interfaces with high contrast colors, large fonts, and screen reader compatibility.
Offer alternative communication methods such as text-to-speech ...read more
Q171. Design Toll system
Design a toll system for collecting fees from vehicles using RFID technology.
Implement RFID technology for automatic vehicle identification
Set up toll booths with RFID readers to detect vehicles
Calculate toll fees based on vehicle type, distance traveled, and time of day
Provide payment options such as prepaid accounts or credit card payments
Q172. Design Uber supplier dispatch
Design Uber supplier dispatch
Create a system to match drivers with riders based on location and availability
Use real-time data to optimize dispatching and reduce wait times
Implement a rating system to ensure quality service from drivers
Integrate with payment and mapping systems for seamless user experience
Q173. How would you design this item storage app
The item storage app should have a user-friendly interface and efficient search functionality.
Design a simple and intuitive user interface with easy navigation.
Include a search bar for quick access to items.
Implement a categorization system for easy organization of items.
Allow users to add, edit, and delete items.
Incorporate a barcode scanner for easy item input.
Ensure data security and privacy.
Consider cloud storage for easy access across devices.
Q174. Propose a system for a popular media stream service
Proposed system for a popular media stream service
Implement a recommendation engine to suggest content based on user preferences and viewing history
Integrate with social media platforms to allow users to share and discuss content
Provide multiple subscription options with varying levels of access and features
Ensure high-quality streaming with minimal buffering through the use of content delivery networks
Implement robust security measures to protect user data and prevent piracy
Q175. Design an Ordering system with multithreading
An ordering system with multithreading for efficient processing
Use a queue data structure to store incoming orders
Create multiple threads to process orders concurrently
Implement synchronization mechanisms to prevent race conditions
Consider using a thread pool to manage threads
Use locks or semaphores to ensure thread safety
Q176. Design ID generator service
Design a scalable ID generator service for unique identification of entities.
Use a combination of timestamp, unique machine identifier, and sequence number to generate IDs.
Implement a distributed system to ensure uniqueness of generated IDs.
Consider using a centralized service for ID generation to avoid conflicts.
Use a high-performance database for storing generated IDs.
Implement error handling and retry mechanisms in case of failures.
Q177. design uber nearest driver
Design a system to match users with the nearest available driver like Uber.
Use geolocation data from both users and drivers to calculate distances.
Implement a matching algorithm to pair users with the nearest available driver.
Consider factors like traffic conditions, driver availability, and user preferences.
Utilize real-time updates to continuously update driver availability and user locations.
Q178. design a system like youtube
Design a system similar to YouTube for video sharing and streaming
Implement user authentication and authorization for uploading and viewing videos
Create a database to store video metadata, user information, and comments
Develop a recommendation algorithm based on user preferences and viewing history
Utilize a content delivery network (CDN) for efficient video streaming
Include features like video monetization, live streaming, and video analytics
Q179. Provide details of current system architecture
Current system architecture includes microservices, containerization, and cloud deployment.
Utilizes microservices architecture for scalability and flexibility
Uses containerization technology like Docker for easy deployment and management
Leverages cloud services such as AWS or Azure for infrastructure
Follows DevOps practices for continuous integration and delivery
Q180. Design round to design a zomato app
Design a Zomato app for food ordering and delivery
Create a user-friendly interface for browsing restaurants and menus
Implement a search function for finding specific cuisines or dishes
Include a rating and review system for restaurants and dishes
Integrate a payment gateway for secure transactions
Develop a tracking system for delivery status
Provide customer support through chat or call
Partner with restaurants for exclusive deals and discounts
Q181. Design an Elastic Load balancer
An Elastic Load Balancer distributes incoming traffic across multiple targets to ensure high availability and scalability.
Choose the appropriate load balancer type (Application, Network, Classic)
Configure health checks to ensure traffic is only sent to healthy targets
Set up auto scaling groups to automatically add or remove targets based on traffic
Use security groups to control access to the load balancer and targets
Consider using SSL/TLS encryption for secure traffic
Monitor ...read more
Q182. HLD: Design a ad-click aggregation service
Design an ad-click aggregation service for tracking and analyzing ad clicks.
Use a distributed system to handle high volume of ad click data
Implement real-time processing for immediate insights on ad performance
Utilize a database to store aggregated ad click data for reporting and analysis
Q183. What is your way of dealing system shortages?
I prioritize critical systems and work with the team to find temporary solutions while addressing the root cause.
Identify critical systems and prioritize them
Collaborate with the team to find temporary solutions
Address the root cause to prevent future shortages
Maintain open communication with stakeholders
Q184. How you designed and implimented
I designed and implemented a scalable microservices architecture using Docker and Kubernetes.
Analyzed the requirements and identified the need for a microservices architecture
Created Docker containers for each microservice to ensure portability and consistency
Utilized Kubernetes for orchestration and scaling of the microservices
Implemented service discovery and load balancing using Kubernetes
Monitored the performance of the microservices using Prometheus and Grafana
Q185. Design a logging service
Design a logging service to capture and store application logs
Define log levels (e.g. INFO, DEBUG, ERROR)
Implement log formatting and timestamping
Support log rotation and retention policies
Consider scalability and performance for high volume logs
Integrate with monitoring and alerting systems
Q186. Design a transaction fraud detection system
Implementing a transaction fraud detection system
Utilize machine learning algorithms to analyze transaction patterns and detect anomalies
Implement real-time monitoring to flag suspicious transactions
Utilize historical data to train the system and improve accuracy
Implement multi-factor authentication for high-risk transactions
Collaborate with financial institutions and law enforcement agencies to share information and improve fraud detection
Q187. Design zomato delivery system
Design a zomato delivery system for efficient food delivery
Implement a user-friendly app for customers to place orders
Develop a system for restaurants to receive and manage orders
Create a network of delivery drivers for timely delivery
Include a rating system for customers to provide feedback on orders
Utilize GPS tracking for real-time order tracking
Q188. Design a distributed trading system platform
Design a distributed trading system platform
Utilize microservices architecture for scalability and fault tolerance
Implement message queues for asynchronous communication between components
Use distributed databases for data storage and retrieval
Implement load balancing and auto-scaling for handling varying loads
Ensure security measures such as encryption and authentication are in place
Q189. Design a car hotel booking system.
Design a car hotel booking system
Create a database to store information about available car hotels
Implement a search feature for users to find and book car hotels
Include a booking system with payment integration
Allow users to leave reviews and ratings for car hotels
Q190. Design a system to update end users SDKs.
Design a system to update end users SDKs.
Implement an automated update system that checks for new SDK versions regularly.
Provide notifications to end users about available updates.
Allow users to manually trigger updates if needed.
Ensure backward compatibility with older SDK versions.
Track update history and provide release notes for each update.
Q191. Design and code a zoo management system.
A zoo management system to track animals, enclosures, staff, and visitor information.
Create classes for animals, enclosures, staff, and visitors
Implement functions for adding, updating, and deleting records
Include features for scheduling feeding times, cleaning enclosures, and managing staff shifts
Q192. Design a market place system
Design a marketplace system for buying and selling goods and services.
Create user accounts for buyers and sellers
Implement search and filter functionality for easy browsing
Include secure payment processing system
Allow users to leave reviews and ratings for products/services
Provide customer support and dispute resolution
Consider scalability and performance for handling large volumes of transactions
Q193. How do you design the system for centralized application
Designing a centralized application system involves creating a single point of access for all users and data.
Identify the core functionalities and data that need to be centralized
Choose a suitable architecture such as microservices or monolithic
Implement a centralized database or data warehouse for storing and accessing data
Use APIs and integration tools to connect different components of the system
Implement security measures to protect the centralized system from unauthorize...read more
Q194. Design a tracking id system
Design a tracking id system for monitoring and identifying items or entities.
Generate unique tracking IDs using a combination of letters, numbers, and symbols
Include information such as date, time, location, and type of item in the tracking ID
Use a centralized database to store and retrieve tracking information
Implement security measures to prevent tampering or duplication of tracking IDs
Q195. Design a dwmand planning system
Design a demand planning system for efficient forecasting and inventory management.
Utilize historical sales data to identify trends and seasonality
Incorporate external factors like market trends, promotions, and competitor activities
Implement machine learning algorithms for accurate demand forecasting
Integrate with inventory management systems for optimized stock levels
Regularly review and adjust the system based on performance metrics
Q196. Explain the architecture of your current system and explain why it was considered
Our current system architecture is a microservices-based architecture designed for scalability and flexibility.
Utilizes microservices to break down the system into smaller, independent services
Uses containers for easy deployment and scaling
Employs API gateways for managing and routing traffic
Includes a message broker for asynchronous communication between services
Q197. Design airline service.
Design an airline service for booking flights and managing reservations.
Create a user-friendly website or mobile app for customers to search and book flights.
Implement a secure payment system for online bookings.
Develop a system for managing flight schedules, seat availability, and reservations.
Include features for customers to check-in online, select seats, and view flight status.
Offer loyalty programs and discounts for frequent flyers.
Q198. Design a in-memory cache
Design a high-performance in-memory cache system for storing and retrieving data efficiently.
Use a hash table or a key-value store to store data in memory
Implement caching strategies like LRU (Least Recently Used) or LFU (Least Frequently Used) to manage cache eviction
Consider using a distributed cache for scalability and fault tolerance
Optimize cache size and expiration policies based on the application's data access patterns
Q199. How do you make sure a throttling system process dropped messages from a slow downstream service?
Implement a throttling system to handle dropped messages from a slow downstream service.
Implement a queue to store messages from the downstream service.
Set a maximum queue size and drop messages when the queue is full.
Use a timestamp to track when messages were received and process them in order.
Implement a retry mechanism to reprocess dropped messages after a certain time.
Monitor the queue size and processing speed to adjust throttling parameters as needed.
Q200. Design a Online System to book Salon Professionals like Urban Company.
Design an online system to book salon professionals like Urban Company.
User registration and login system
Search functionality to find salon professionals based on location, services offered, ratings, etc.
Booking system with calendar availability and payment integration
Review and rating system for users to provide feedback on salon professionals
Notification system for booking confirmations, reminders, and updates
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