5 min read gRPC Fundamentals gRPC uses HTTP/2 as its transport and Protocol Buffers as its serialization format. Compared to REST+JSON: strongly typed […] Read article
6 min read Quota Management Service: Low-Level Design A quota management service defines resource limits per customer or user, tracks real-time usage against Read article
5 min read A/B Test Assignment Service: Low-Level Design An A/B test assignment service determines which experiment variant a user sees and guarantees Read article
5 min read Experiment Logging Service: Low-Level Design The experiment logging service collects exposure and conversion events, computes metric values per variant, runs Read article
5 min read Holdout Group Service: Low-Level Design A holdout group service maintains a permanently withheld cohort of users who never receive new Read article
5 min read Clickstream Analytics Pipeline: Low-Level Design A clickstream analytics pipeline captures every user interaction on a web or mobile product, processes Read article
5 min read User Journey Tracker: Low-Level Design A user journey tracker records every touchpoint across devices and channels, resolves them to a Read article
5 min read What Faceted Search Is Faceted search lets users progressively narrow results using multiple independent filter dimensions — category, price range, Read article
6 min read The Inverted Index Full-text search is powered by an inverted index — a data structure that maps each unique term Read article
6 min read The Core Requirement Autocomplete must return the top-K relevant completions for a given prefix within 50ms p99 from the moment Read article
6 min read URL Scheme and Parameter Design A thumbnail service exposes a clean HTTP API for on-demand image transformation. The URL encodes Read article
5 min read The Core Problem A follower feed must show a user the recent posts from everyone they follow, sorted by recency, Read article
5 min read What Phone Verification Accomplishes Phone verification confirms that a user possesses a specific phone number at registration or for two-factor Read article
6 min read What KYC Is and Why It's Hard Know Your Customer (KYC) is the process by which a business verifies the Read article
5 min read Why Feature Toggles? Feature toggles (also called feature flags or feature switches) decouple code deployment from feature release. You ship Read article
