Ride-Sharing App (Uber/Lyft) High-Level System Design
6 min read Core Services A ride-sharing platform like Uber or Lyft decomposes into focused microservices: Location Service: ingests driver GPS pings, maintains […] Read article
System Design
System Design
File Storage System (Google Drive / Dropbox) Low-Level Design
6 min read Requirements Design a file storage system like Google Drive or Dropbox supporting: Upload and download files up to 50 GB Read article
Algorithms, Coding Interview Questions, System Design
Object-Oriented Design Patterns for Coding Interviews
7 min read Design patterns appear in coding interviews in two ways: the interviewer asks you to implement a specific pattern, or you’re Read article
System Design
Ticket Booking System Low-Level Design
9 min read A ticket booking system like Ticketmaster must handle concurrent seat selection, hold expiry, payment confirmation, and flash sale traffic spikes. Read article
System Design
Proximity Service (Find Nearby) Low-Level Design
8 min read A proximity service answers “find all restaurants / drivers / users within R km of this location” with low latency Read article
Algorithms, Coding Interview Questions, Dynamic Programming
Stock Trading Dynamic Programming Interview Patterns
7 min read Stock trading dynamic programming problems are a classic interview cluster. Every variant – one transaction, unlimited, at most k, cooldown, Read article
System Design
Gaming Leaderboard System Low-Level Design
8 min read Requirements A gaming leaderboard system must support: Update a player’s score in real-time (on match completion) Query a player’s current Read article
Algorithms, Coding Interview Questions, Dynamic Programming
Dynamic Programming on Intervals Interview Patterns
9 min read What is Interval DP? Interval DP is a dynamic programming pattern where you optimize over all sub-intervals of a range. Read article
System Design
Search Engine System Low-Level Design
8 min read Overview A search engine has four major subsystems working in a pipeline: a web crawler fetches pages from the internet, Read article
System Design
Live Video Streaming System Low-Level Design
9 min read Requirements Design a live video streaming platform comparable to Twitch or YouTube Live. Key requirements: support millions of concurrent viewers Read article
Algorithms, Coding Interview Questions, Dynamic Programming, Matrix
2D Dynamic Programming Interview Patterns
10 min read 2D DP Pattern Overview 2D dynamic programming problems use a 2D table where dp[i][j] represents the optimal value considering only Read article
System Design
Event-Driven Architecture System Design
9 min read What is Event-Driven Architecture In event-driven architecture (EDA), services communicate by publishing and consuming events rather than making direct synchronous Read article
System Design
Analytics Data Pipeline System Design
10 min read Analytics Data Pipeline System Design Analytics pipelines move raw events from user actions into queryable dashboards. The core challenge: volume Read article
Algorithms, Coding Interview Questions, Data Structures, Heap
Advanced Heap Interview Patterns
10 min read Advanced Heap Interview Patterns Heaps appear in a surprising number of interview problems beyond the simple “find the Kth largest Read article
System Design
Recommendation System Low-Level Design
10 min read Recommendation System Low-Level Design Recommendation systems are one of the highest-ROI components in consumer products. They solve the discovery problem: Read article
