System Design

⏱ 7 min read What Is a RAG Pipeline? Retrieval-Augmented Generation (RAG) is an architecture that improves LLM output quality by retrieving relevant documents […] Read article

⏱ 8 min read What Is an AI Content Safety Service? An AI content safety service filters and classifies text (and other modalities) produced Read article

⏱ 6 min read Problem Statement Design a scalable IoT data ingestion service that handles millions of connected devices sending sensor readings, events, and Read article

⏱ 6 min read Problem Statement Design a telemetry pipeline that collects metrics from thousands of services and infrastructure nodes, applies sampling and aggregation, Read article

⏱ 6 min read What Is a Document Management System? A document management system (DMS) stores, organizes, and retrieves files in a way that Read article

⏱ 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

⏱ 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

⏱ 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

⏱ 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

⏱ 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

⏱ 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

⏱ 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

⏱ 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

⏱ 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

⏱ 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