Uncategorized

API key rotation is a security control that limits the blast radius of a leaked credential. A well-designed rotation service […]

Configuration drift is one of the most common root causes of production incidents. A config diff and change management service

In a SaaS product, onboarding a new customer involves far more than creating a database row. The tenant provisioning service

Real-Time Location Service A real-time location service ingests high-frequency position updates from mobile clients, indexes them for low-latency spatial queries,

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

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

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

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