Saga Orchestrator: Low Level Design The Saga pattern manages distributed transactions across microservices. An orchestrator-based saga drives each step sequentially […]

CQRS Service: Low Level Design CQRS (Command Query Responsibility Segregation) separates the write model (commands) from the read model (queries),

Overview A schema registry is a centralized store for event and message schemas used in event-driven architectures. Producers register schemas

A metrics pipeline collects numeric time-series data from every service and infrastructure component, aggregates it efficiently, stores it compactly, and

What Is a Configuration Push Service? A configuration push service stores application configuration, propagates changes to all connected clients in

What Is a Feature Toggle Service? A feature toggle service stores toggle definitions, evaluates them against a user and request

What Is an A/B Test Assignment Service? An A/B test assignment service deterministically buckets users into experiment variants, maintains consistent

What Is a Progress Tracker Service? A progress tracker service ingests completion events from multiple upstream services, detects when users

What Is a Watchlist Service? A watchlist service lets users curate personal lists of content items they intend to watch,

What Is a Media Player Service? A media player service manages server-side playback state, persists resume positions across sessions and

What Is a Content Feed Ranking Service? A content feed ranking service orders a candidate set of content items for

What Is an FX Rate Service? An FX rate service aggregates exchange rate quotes from multiple external providers, computes a

What Is the Device Authorization Flow? The OAuth 2.0 Device Authorization Grant (RFC 8628) enables input-constrained devices — smart TVs,

What Is Refresh Token Rotation? Refresh tokens authorize the issuance of new access tokens after the short-lived access token expires.

What Is an Access Token Service? An access token service issues short-lived cryptographically signed tokens that authorize access to protected