Engineering Notes

Practical guides for AI, automation, and product engineering.

Field notes from systems I build: agents, n8n workflows, developer tools, micro-SaaS, and production architecture.

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EngineeringArchitecting Scalable JavaScript: OOP Principles & Design Patterns

Avnish Yadav – February 21, 2026 · 7 MIN READ

Architecting Scalable JavaScript: OOP Principles & Design Patterns

Move beyond basic scripts. Learn how to apply Object-Oriented Programming principles and implement the Singleton, Observer, and Module patterns to build robust, scalable JavaScript automation systems.

LearnDemystifying CORS, HTTP, and Security: A Builder’s Guide

Avnish Yadav – February 21, 2026 · 8 MIN READ

Demystifying CORS, HTTP, and Security: A Builder’s Guide

That red CORS error in your console isn't a bug—it's a feature. We dive deep into HTTP protocols, the browser's Same-Origin Policy, and how to secure your automation agents and micro-SaaS APIs properly.

EngineeringUnderstanding the JavaScript Runtime: Event Loop, Call Stack, and Task Queue Explained

Avnish Yadav – February 21, 2026 · 8 MIN READ

Understanding the JavaScript Runtime: Event Loop, Call Stack, and Task Queue Explained

JavaScript is single-threaded, yet it handles asynchronous operations effortlessly. Here is a deep dive into the runtime architecture—Call Stack, Web APIs, and the Event Loop—to master how your code actually executes.

Practical guides for AI, automation, and product engineering.

Essays, tutorials, and systems notes.

Start with the newest deep dive

Architecting Scalable JavaScript: OOP Principles & Design Patterns

Demystifying CORS, HTTP, and Security: A Builder’s Guide

Understanding the JavaScript Runtime: Event Loop, Call Stack, and Task Queue Explained

Beyond the Tags: Mastering HTML Architecture for Product-Based Roles

Mastering the Primitives: A Builder's Guide to JavaScript Data Types and Functions

Demystifying Scope and Closure: Key Concepts for Writing Robust JavaScript