10 min read Distributed Tracing System: Low-Level Design A distributed tracing system records the journey of a request as it propagates through multiple […] Read article
10 min read Multi-Region Failover System: Low-Level Design A multi-region failover system routes traffic away from a failing region to a healthy standby, Read article
9 min read Tenant Isolation System: Low-Level Design A multi-tenant SaaS application serves many organizations (tenants) from a shared infrastructure. Tenant isolation ensures Read article
10 min read Saga Orchestration System: Low-Level Design A saga is a sequence of local transactions, each in a separate service, that together Read article
8 min read SLA Monitoring System: Low-Level Design An SLA monitoring system tracks whether a service is meeting its availability, latency, and error Read article
9 min read Canary Deployment System: Low-Level Design A canary deployment system routes a small fraction of production traffic to a new version Read article
9 min read Webhook Subscription System: Low-Level Design A webhook subscription system lets external developers register URLs to receive event notifications. Unlike the Read article
9 min read Payment Refund System: Low-Level Design A payment refund system reverses a completed charge — partially or fully — and ensures Read article
8 min read Activity Feed Aggregator: Low-Level Design An activity feed aggregator collects events from multiple services — post created, user followed, payment Read article
8 min read Document Versioning System: Low-Level Design A document versioning system preserves every historical state of a document so users can view, Read article
8 min read Invite System Low-Level Design An invite system lets existing users bring new members into a product — a workspace, a Read article
8 min read Email Unsubscribe System: Low-Level Design An email unsubscribe system lets users opt out of specific email categories while maintaining compliance Read article
9 min read Search Index System: Low-Level Design A search index system converts raw documents into a structure that supports fast full-text queries. Read article
10 min read Job Queue System: Low-Level Design A job queue system schedules and executes background work: sending emails, resizing images, generating reports, Read article
11 min read Approval Workflow System: Low-Level Design An approval workflow routes a request — a purchase order, a content post, a contract, Read article
