8 min read Two Pointers Fundamentals Two pointers use two indices traversing an array or string to solve problems in O(n) that would […] Read article
8 min read The Sliding Window Technique The sliding window technique optimizes brute-force O(n^2) or O(n^3) problems to O(n) by maintaining a window […] Read article
8 min read Why Distributed Locks Are Needed In a distributed system, multiple instances of a service may run concurrently. When these instances […] Read article
8 min read Why Content Moderation Is a Hard Systems Problem A platform with 500 million daily active users generates billions of pieces […] Read article
8 min read Why Recommendations Matter Netflix reports that 80% of content watched is discovered through recommendations. Spotify generates 30% of its streams […] Read article
8 min read Why Payment Systems Are Hard Payment systems are among the hardest distributed systems to design because money movement requires exactly-once […] Read article
8 min read Problem Overview Design a location-based service that allows users to find nearby businesses (Yelp) or navigate between locations (Google Maps). […] Read article
8 min read Problem Overview Design a leaderboard and matchmaking system for a multiplayer game with 50 million players. The leaderboard shows global […] Read article
8 min read IoT system design is increasingly common at Amazon (AWS IoT), Google (Cloud IoT), Tesla, Nest, and any company building connected […] Read article
9 min read Ad serving is at the core of Google and Meta businesses and is one of the highest-stakes systems in the […] Read article