Low Level Design: LLM Gateway Service
7 min read What Is an LLM Gateway? An LLM gateway is a service layer that sits between your application and one or […] Read article
System Design
System Design
Low Level Design: Telemetry Pipeline
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
System Design
Low Level Design: IoT Data Ingestion Service
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
System Design
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
Low Level Design: Document Management System
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
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: 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: 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: 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: 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: 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