Author name: Admin

⏱ 6 min read A payments system processes financial transactions — charge customers, transfer funds, process refunds. Unlike typical web applications, payments demand ACID […] Read article

⏱ 6 min read A recommendation system suggests relevant items to users — products to buy, videos to watch, friends to follow. At Netflix, Read article

⏱ 6 min read A social network feed aggregates posts from accounts a user follows, ranked by relevance or recency. At Instagram or Twitter Read article

⏱ 6 min read A file storage system (like Dropbox or Google Drive) stores user files, provides sync across devices, and handles concurrent edits. Read article

⏱ 6 min read A video streaming platform (like Netflix or YouTube) must ingest raw video, encode it into multiple quality levels, distribute it Read article

⏱ 6 min read A search autocomplete system provides real-time suggestions as users type, ranking completions by popularity or relevance. At Google or Amazon Read article

⏱ 6 min read A notification system delivers messages to users through one or more channels — push notifications, email, SMS, in-app. At scale Read article

⏱ 6 min read A URL shortener converts a long URL into a short alias (e.g., bit.ly/abc123) that redirects to the original. Building one Read article

⏱ 5 min read A time series database (TSDB) is optimized for storing and querying time-stamped data — metrics, sensor readings, financial prices, event Read article

⏱ 6 min read The gossip protocol (epidemic protocol) is a peer-to-peer communication method where each node periodically shares information with a small number Read article

⏱ 6 min read Real-time server-to-client communication requires the server to push data without waiting for a client request. Three primary patterns exist: long Read article

⏱ 5 min read Exactly-once delivery means that every message is processed precisely once — neither lost (at-least-once) nor delivered multiple times (at-most-once). True Read article

⏱ 6 min read Observability is the ability to understand the internal state of a system from its external outputs. A system is observable Read article

⏱ 6 min read Raft is a distributed consensus algorithm designed to be understandable — a deliberate contrast to Paxos, which is notoriously difficult Read article

⏱ 6 min read Backpressure is a mechanism that allows a downstream component to signal an upstream component to slow down — preventing fast Read article