- Design Truecaller
- Design Snake and Ladder Game
- Design Bill Sharing/Expense Sharing like Splitwise
- Design Amazon Locker Service
- Design Vehicle/Car Rental Application like Zoomcar
- Design Distributed ID Generation like Twitter Snowflake ID
- Implement a logger
- Cab Booking like Uber, Ola
- Design Parking Lot System
- Design Chess Game
- Design Cache System
- Design an Online Book Reader System
- Design an Online Hotel Booking System
- Design a Logistics System
- Design Tic Tac Toe
- Design a Configuration Management System
- Design a Vending Machine
- Design Maps Navigator Client for different transportation types (OOD)
- Design a JSON Parser from scratch
- Design Elevator
- CricInfo/Cricbuzz
- TikTok
- Movie Ticket Booking
- Uber Eats/DoorDash/Swiggy
- E-commerce Review System