6 min read What Is a Distributed Message Queue? A message queue decouples producers (services that generate work) from consumers (services that process […] Read article
6 min read String Algorithm Patterns in Interviews String problems are ubiquitous in coding interviews. Most string challenges reduce to a small set Read article
6 min read What Is a Live Sports Score System? A live sports score system delivers real-time score updates to millions of concurrent Read article
6 min read What Is a Cloud File Storage System? A cloud file storage system lets users upload, sync, and share files across Read article
5 min read What Is a Web Crawler and Search Indexer? A web crawler systematically downloads web pages. A search indexer processes those Read article
6 min read What Is Union-Find? Union-Find (Disjoint Set Union, DSU) is a data structure that tracks a collection of elements partitioned into Read article
5 min read What Is an Online Auction System? An online auction system allows sellers to list items and buyers to place competitive Read article
6 min read Why Multi-Region Databases? A single-region database has two critical weaknesses: latency (users in Europe querying a US database experience 150ms+ Read article
6 min read What Are Greedy Algorithms? A greedy algorithm makes the locally optimal choice at each step, never backtracking, hoping that local Read article
6 min read What Is a Streaming Data Pipeline? A streaming data pipeline continuously ingests, processes, and routes events in real time — Read article
5 min read System Design Interview: Design a Geospatial Service (Nearby Search) Geospatial services power “find restaurants near me,” Uber driver lookup, and Read article
5 min read System Design Interview: Design a Cryptocurrency Exchange (Coinbase / Binance) A cryptocurrency exchange enables users to buy, sell, and trade Read article
5 min read Recursion and Memoization Interview Patterns Memoization transforms exponential recursive solutions into polynomial ones by caching subproblem results. In Python, @lru_cache Read article
5 min read System Design Interview: Design an E-Commerce Platform (Amazon / Shopify) An e-commerce platform handles product discovery, inventory management, order processing, Read article
6 min read Interval DP and Advanced Dynamic Programming Patterns Interval DP solves optimization problems over contiguous subarrays or subsequences. The core idea: Read article
