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Choosing between gRPC and REST is a fundamental API design decision with significant implications for performance, developer experience, and interoperability. […]

Zero-downtime deployments allow updating a running service without any period of unavailability to users. As services move to continuous delivery

Multi-tenancy is an architecture where a single software instance serves multiple customers (tenants) with logical isolation between them. It is

A service mesh is an infrastructure layer that handles service-to-service communication in a microservices architecture, providing observability, traffic management, and

Consistent hashing solves the data redistribution problem in distributed systems. With naive modulo hashing (key % N), adding or removing

A publish-subscribe (pub/sub) messaging system decouples producers (publishers) from consumers (subscribers) through a message broker. Publishers emit events to topics

A data warehouse is an analytical database optimized for read-heavy, aggregation-heavy workloads over large historical datasets. Unlike OLTP databases designed

Cache invalidation — ensuring cached data reflects the current state of the source of truth — is famously difficult. Phil

An image processing pipeline handles user-uploaded images: validating, resizing, compressing, and formatting them for web and mobile delivery. Instagram, Pinterest,

An object storage system stores arbitrary binary data (files, images, videos, backups) addressable by a globally unique key, with near-infinite

Two-factor authentication (2FA) requires users to present two forms of evidence: something they know (password) and something they have (phone,

A Content Delivery Network (CDN) caches content at edge servers distributed globally — close to users — to reduce latency

OAuth2 is an authorization framework that lets users grant third-party applications limited access to their data without sharing passwords. OpenID

An API gateway is the single entry point for all client requests in a microservices architecture. It sits in front

A typeahead (autocomplete) service returns ranked completions for a query prefix in under 100ms. Google Search completes queries as you