⏱ 9 min read What Is a Service Mesh? A service mesh is an infrastructure layer that manages service-to-service communication in a microservices architecture. […] Read article

⏱ 8 min read What Is a Currency Conversion Service? At low level, a currency conversion service must handle provider staleness, cross-rate computation from Read article

⏱ 8 min read What Is an Address Validation Service? An address validation service takes raw user-entered address text, standardizes it to a canonical Read article

⏱ 8 min read What Is a Billing and Invoicing System? A billing and invoicing system manages subscription lifecycles, generates accurate invoices, collects payment, Read article

⏱ 8 min read What Is Collaborative Document Editing? Collaborative document editing allows multiple users to concurrently modify a shared document with changes reflected Read article

⏱ 7 min read What Is an Access Control List System? An Access Control List (ACL) system determines whether a given subject is permitted Read article

⏱ 9 min read ` in this article (HTTP Delivery Logic, Manual Replay API, Circuit Breaker) already carries 1–2 sentences of concrete guidance. Per Read article

⏱ 8 min read A scheduled task manager triggers recurring jobs on cron schedules reliably across distributed infrastructure. The core problems are: parsing cron Read article

⏱ 7 min read A priority queue service ensures that high-urgency work is processed before lower-urgency work even when the system is under load. Read article

⏱ 7 min read Throttling Tiers Three tiers compose the throttling hierarchy: The per-endpoint tier is a global rate limit on a specific endpoint Read article

⏱ 7 min read Backpressure is the mechanism by which an overwhelmed consumer signals upstream producers to slow down. Without it, producers fill unbounded Read article

⏱ 7 min read Blue-green deployment eliminates downtime by maintaining two identical production environments. At any moment, one environment (blue) serves 100% of live Read article

⏱ 7 min read Dark Launch System Low-Level Design A dark launch (also called shadow testing or dark traffic) deploys a new service version Read article

⏱ 8 min read Saga Compensation Pattern Low-Level Design Distributed transactions across microservices cannot use two-phase commit at scale — it introduces tight coupling Read article

⏱ 7 min read Message Deduplication System Low-Level Design Distributed messaging systems face a fundamental challenge: networks are unreliable, and any message may be Read article