Articles on software engineering, system design, frontend, backend, and lessons learned from building real-world applications.https://afiiif.github.io/en-usTue, 04 Aug 2026 00:00:00 GMThttps://afiiif.github.io/blog/reimplementing-zustand-with-built-in-async-state/https://afiiif.github.io/blog/reimplementing-zustand-with-built-in-async-state/What started as an experiment to recreate Zustand eventually became a lightweight async state manager inspired by TanStack Query. Here's the engineering journey behind it.Tue, 04 Aug 2026 00:00:00 GMTfrontendreacthttps://afiiif.github.io/blog/hidden-complexity-of-campaign/https://afiiif.github.io/blog/hidden-complexity-of-campaign/An engineering case study on improving a production campaign system through observability, business rules, background jobs, reliability, and scalability.Sat, 25 Jul 2026 00:00:00 GMTbackendhttps://afiiif.github.io/blog/understanding-the-observer-pattern-by-building-one/https://afiiif.github.io/blog/understanding-the-observer-pattern-by-building-one/Build the Observer Pattern from scratch in JavaScript. Learn subscriptions, state changes, and create a robust, reusable store step by step.Tue, 21 Jul 2026 00:00:00 GMTpatternjavascripthttps://afiiif.github.io/blog/misusing-react-context-then-blaming-react-context/https://afiiif.github.io/blog/misusing-react-context-then-blaming-react-context/Stop blaming React Context for unnecessary re-renders. Discover how React composition affects rendering performance and how to build efficient Context providers.Thu, 16 Jul 2026 00:00:00 GMTfrontendreact