Low Level Design: CQRS Service
4 min read CQRS Service: Low Level Design CQRS (Command Query Responsibility Segregation) separates the write model (commands) from the read model (queries), […] Read article
System Design
System Design
Low Level Design: Saga Orchestrator
5 min read Saga Orchestrator: Low Level Design The Saga pattern manages distributed transactions across microservices. An orchestrator-based saga drives each step sequentially Read article
System Design
Low Level Design: Schema Registry
7 min read Overview A schema registry is a centralized store for event and message schemas used in event-driven architectures. Producers register schemas Read article
System Design
Low Level Design: Metrics Pipeline
10 min read A metrics pipeline collects numeric time-series data from every service and infrastructure component, aggregates it efficiently, stores it compactly, and Read article
System Design
A/B Test Assignment Service Low-Level Design: Bucketing, Consistency, and Override Support
5 min read What Is an A/B Test Assignment Service? An A/B test assignment service deterministically buckets users into experiment variants, maintains consistent Read article
System Design
Feature Toggle Service Low-Level Design: Toggle Types, Evaluation Order, and Kill Switch
5 min read What Is a Feature Toggle Service? A feature toggle service stores toggle definitions, evaluates them against a user and request Read article
System Design
Configuration Push Service Low-Level Design: Change Propagation, Client SDK, and Rollback
6 min read What Is a Configuration Push Service? A configuration push service stores application configuration, propagates changes to all connected clients in Read article
System Design
Media Player Service Low-Level Design: Playback State, Resume Position, and Quality Selection
5 min read What Is a Media Player Service? A media player service manages server-side playback state, persists resume positions across sessions and Read article
System Design
Watchlist Service Low-Level Design: List Management, Priority Ordering, and Cross-Device Sync
5 min read What Is a Watchlist Service? A watchlist service lets users curate personal lists of content items they intend to watch, Read article
System Design
Progress Tracker Service Low-Level Design: Completion Events, Milestone Detection, and Streak Calculation
5 min read What Is a Progress Tracker Service? A progress tracker service ingests completion events from multiple upstream services, detects when users Read article
System Design
FX Rate Service Low-Level Design: Provider Aggregation, Spread Calculation, and Stale Rate Handling
5 min read What Is an FX Rate Service? An FX rate service aggregates exchange rate quotes from multiple external providers, computes a Read article
System Design
Content Feed Ranking Service Low-Level Design: Scoring Model, Diversity Injection, and Feedback Loop
5 min read What Is a Content Feed Ranking Service? A content feed ranking service orders a candidate set of content items for Read article
System Design
Access Token Service Low-Level Design: JWT Signing, Key Rotation, and Claim Customization
5 min read What Is an Access Token Service? An access token service issues short-lived cryptographically signed tokens that authorize access to protected Read article
System Design
Refresh Token Rotation Service Low-Level Design: Family Invalidation, Reuse Detection, and Binding
5 min read What Is Refresh Token Rotation? Refresh tokens authorize the issuance of new access tokens after the short-lived access token expires. Read article
System Design
Device Authorization Flow Low-Level Design: Device Code, Polling, and Token Binding
5 min read What Is the Device Authorization Flow? The OAuth 2.0 Device Authorization Grant (RFC 8628) enables input-constrained devices — smart TVs, Read article