Low Level Design: Wiki Service
7 min read What Is a Wiki Service? A wiki service lets users create and edit interconnected pages in a structured knowledge base. […] Read article
System Design
System Design
Low Level Design: Mention and @Tagging Service
2 min read Mention service content See also: Meta Interview Guide 2026: Facebook, Instagram, WhatsApp Engineering See also: Netflix Interview Guide 2026: Streaming Read article
System Design
Low Level Design: User Follow / Subscribe Service
9 min read What Is a User Follow Service? A user follow (or subscribe) service manages directed relationships between users: when Alice follows Read article
System Design
Low Level Design: Voting and Reaction System
8 min read Problem Statement Design a voting and reaction system that allows users to upvote, downvote, or attach emoji reactions to content Read article
System Design
Low Level Design: Internationalization Service
8 min read Problem Statement Design an internationalization (i18n) service that allows a large multi-product platform to serve user-facing strings in dozens of Read article
System Design
Low Level Design: Access Review Service
9 min read Problem Statement Design an access review service that enables organizations to periodically certify user entitlements. The service must snapshot current Read article
System Design
Low Level Design: Internal Service Catalog
9 min read What Is an Internal Service Catalog? An internal service catalog is a centralized registry where every service in your infrastructure Read article
System Design
Low Level Design: Currency Conversion Service
8 min read Problem Statement Design a currency conversion service that ingests exchange rates from one or more external providers, stores current and Read article
System Design
Low Level Design: Search Filter and Faceting Service
11 min read What Is a Search Filter and Faceting Service? A search filter and faceting service enables users to narrow search results Read article
System Design
Low Level Design: Event Analytics Pipeline
10 min read Overview An event analytics pipeline is the backbone of any product analytics product. It ingests raw behavioral events from client Read article
System Design
Low Level Design: Funnel Analysis Service
12 min read Overview A funnel analysis service determines what fraction of users complete an ordered sequence of steps — for example, landing Read article
System Design
Low Level Design: Video Conferencing Service
8 min read Overview A video conferencing service enables real-time audio and video communication between multiple participants. At scale, this involves signaling servers, Read article
System Design
Low Level Design: Screen Sharing Service
8 min read Overview Screen sharing transmits a host’s display or application window to remote viewers in real time. The challenge is minimizing Read article
System Design
Low Level Design: Collaborative Whiteboard
10 min read Overview A collaborative whiteboard allows multiple users to simultaneously draw, add shapes, write text, and move objects on a shared Read article
System Design
Low Level Design: Marketplace Payment Service
8 min read Overview A marketplace payment service handles money flows in a multi-sided marketplace where a buyer pays a platform, the platform Read article