Serverless

Prerequisite: This is the executive summary and introductory overview of the Modular Monolith Architecture series. No prior reading is required to start here. Part 0: Executive Summary — How Amazon Prime Video Saved 90% on Infrastructure Costs Answer-first: Amazon Prime Video reduced infrastructure costs by 90% by consolidating their audio/video monitoring service from serverless AWS Lambda and Step Functions into a single modular monolith on ECS. This transition eliminated high-frequency state transition fees and S3 network bottlenecks, proving that in-memory data passing consistently outperforms distributed microservices for high-throughput workloads. ...

Tech Radar: WASI 0.3 & Component Model: Polyglot Cloud-Native Wasm in 2026 Answer-First: Ratification of WASI 0.3 introduces first-class asynchronous streaming (stream<T>, future<T>) into the WebAssembly Component Model. Powered by Wasmtime 46+ and Cranelift AOT, server-side Wasm delivers sub-millisecond cold starts (<1ms), 1–10MB memory footprints (95% smaller than containers), and nanosecond inter-component IPC, making Wasm the premier high-density execution sandbox for cloud-native microservices and edge computing. 1. Architectural Paradigm Shift: From WASI 0.2 to WASI 0.3 While WASI 0.2 (Preview 2) stabilized WebAssembly Interface Types (WIT) and resource types, it relied on synchronous blocking semantics or complex polled loops for I/O operations. This imposed severe latency penalties when composing distributed microservice graphs. ...

Cloudflare D1 & Workers: Serverless E-Commerce Architecture Answer-first: A serverless e-commerce architecture pairs Cloudflare Workers with D1 edge SQLite and Durable Objects to deliver sub-15ms global API latency with zero cold starts. Durable Objects act as transactional single-writer actors preventing inventory overselling, while D1 provides globally read-replicated SQL persistence, eliminating dedicated Redis clusters and reducing infrastructure operating costs by up to 85%. Prerequisite: Familiarity with TypeScript, Cloudflare Workers runtime (workerd), relational SQL schemas, and distributed actor concurrency models. ...