Experiment Logging and Analysis Service An experiment logging and analysis service captures assignment and metric events from running A/B tests, […]

Low Level Design: Pastebin Service A Pastebin service lets users store and share text (code, configs, logs) via a short

Ingestion: Chunked Upload and Raw Storage Large video files cannot be uploaded in a single HTTP request reliably. The ingestion

Upload Flow When a client uploads an image, the request hits an API gateway that performs initial validation: file size

A metrics collection service captures numeric measurements over time, stores them efficiently, and powers alerting and dashboards. This post covers

Streaming Analytics Service: Low Level Design A streaming analytics service ingests high-velocity event data, applies stateful computations in real time,

What Are Read Receipts? Read receipts tell message senders whether their messages have been delivered and read. The feature is

A news feed service delivers a ranked, personalized stream of posts to each user. The central design question is delivery

A payment dispute resolution service manages the lifecycle from the moment a customer contests a charge through investigation, bank communication,

Overview A calendar and meeting invite service lets users create events, invite attendees, track RSVPs, and synchronize with external calendar

A password manager is security-critical software. Every design decision either exposes user secrets or protects them. The central architectural constraint

The transactional outbox pattern solves one of the most common reliability problems in microservices: how to write to a database

Overview A data anonymization service transforms raw datasets containing personally identifiable information (PII) into privacy-safe versions that can be used

What Is a Distributed Caching Layer? A distributed caching layer sits between your application and its primary data store, serving

A dynamic pricing engine adjusts prices in real time based on demand signals, inventory, and business rules. The design must