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.

76Published articles

2/4Current page

AllActive track

Learning Tracks

Essays, tutorials, and systems notes.

AI Agents Automation Dev Tools Japanese Learning

Browse Library

Showing 25-48 of 76 articles

All Salesforce AI Agents Python AI Automation Dev Tools Micro SaaS Web Development

EngineeringInside the V8 Engine: A Deep Dive into JavaScript Execution

Avnish Yadav – February 21, 2026 · 8 MIN READ

Inside the V8 Engine: A Deep Dive into JavaScript Execution

JavaScript isn't just interpreted; it's a complex hybrid of interpretation and JIT compilation. This guide breaks down how Chrome's V8 engine parses, compiles, and optimizes your code—and why knowing this makes you a better engineer.

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.

TutorialsWhy TypeScript Matters: Adding Type Safety to Your JavaScript Projects

Avnish Yadav – February 21, 2026 · 7 MIN READ

Why TypeScript Matters: Adding Type Safety to Your JavaScript Projects

JavaScript is flexible, but that flexibility comes at a cost. Here is why switching to TypeScript isn't just a trend—it's an engineering necessity for scalable systems.

Software EngineeringREST vs. GraphQL: A Frontend Engineer’s Reality Check

Avnish Yadav – February 21, 2026 · 7 MIN READ

REST vs. GraphQL: A Frontend Engineer’s Reality Check

Stop looking for a winner. In this build-focused guide, we implement a simple API consumer for both REST and GraphQL to uncover the real-world trade-offs in caching, payload size, and developer experience.

DevelopmentSecure Frontend Auth: The Definitive Guide to JWTs, Cookies, and Storage Strategies

Avnish Yadav – February 21, 2026 · 7 MIN READ

Secure Frontend Auth: The Definitive Guide to JWTs, Cookies, and Storage Strategies

Stop storing JWTs in LocalStorage. This guide breaks down the security trade-offs between storage strategies and walks through implementing a production-grade authentication flow using HttpOnly cookies and Axios interceptors.

Workflow AutomationMastering Chrome DevTools: Debugging Techniques That Save Hours of Development Time

Avnish Yadav – February 21, 2026 · 7 MIN READ

Mastering Chrome DevTools: Debugging Techniques That Save Hours of Development Time

Stop relying solely on console.log. Discover advanced Chrome DevTools workflows—from Logpoints to Network Overrides—that transform how you diagnose and fix bugs.

Web DevelopmentMastering the Metal: Essential Web APIs & Browser Internals for Frontend Engineers

Avnish Yadav – February 21, 2026 · 8 MIN READ

Mastering the Metal: Essential Web APIs & Browser Internals for Frontend Engineers

Frameworks abstract the complexity, but understanding the browser is what separates coders from engineers. Here is a deep dive into Web APIs, the Event Loop, and Client-Side Storage architectures.

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.

TutorialsMastering Asynchronous Operations with JavaScript Promises: A Builder's Guide

Avnish Yadav – February 21, 2026 · 8 MIN READ

Mastering Asynchronous Operations with JavaScript Promises: A Builder's Guide

Stop writing blocking code. Learn how to architect robust non-blocking systems by building a multi-city weather dashboard using JavaScript Promises, fetch chains, and parallel execution patterns.

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.

Software EngineeringModern Async Patterns: Making Asynchronous Code Readable with Async/Await and Generators

Avnish Yadav – February 21, 2026 · 6 MIN READ

Modern Async Patterns: Making Asynchronous Code Readable with Async/Await and Generators

Stop writing spaghetti code. Learn how to refactor complex Promise chains into clean async/await flows and leverage Generators for efficient data streaming.

ConceptsFrom Prototypes to ES6 Classes: Understanding JavaScript's Object-Oriented Nature

Avnish Yadav – February 21, 2026 · 7 MIN READ

From Prototypes to ES6 Classes: Understanding JavaScript's Object-Oriented Nature

JavaScript classes are often misunderstood as traditional blueprints. In reality, they are syntactic sugar over a unique prototypal inheritance model. Here is how the engine actually works.

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

Avnish Yadav – February 21, 2026 · 7 MIN READ

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

Product-based interviews don't ask about tag names; they ask about the DOM, accessibility trees, and rendering paths. Learn the architecture of HTML.

DevelopmentFrom Selectors to BEM: CSS Concepts You Must Know for Professional Projects

Avnish Yadav – February 21, 2026 · 7 MIN READ

From Selectors to BEM: CSS Concepts You Must Know for Professional Projects

CSS is easy to write but hard to maintain. In this guide, I break down the evolution from basic selectors to the BEM methodology, showing you how to architect scalable, conflict-free styles for production applications.

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

Avnish Yadav – February 21, 2026 · 7 MIN READ

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

Software is just data plus logic. This guide breaks down JavaScript's primitives, reference types, and function architectures with practical examples relevant to building automation and micro-SaaS tools.

Web DevelopmentOvercoming the Daunting Start: A Strategic Roadmap for New Frontend Developers

Avnish Yadav – February 21, 2026 · 7 MIN READ

Overcoming the Daunting Start: A Strategic Roadmap for New Frontend Developers

The modern frontend landscape is overwhelming. This isn't just a list of technologies; it's a strategic systems approach to moving from zero to a deployable engineer.

LearnDemystifying Scope and Closure: Key Concepts for Writing Robust JavaScript

Avnish Yadav – February 21, 2026 · 7 MIN READ

Demystifying Scope and Closure: Key Concepts for Writing Robust JavaScript

Mastering the mechanics of variable lifecycle and data persistence is the difference between a script that works and an application that scales. Here is a deep dive into JavaScript's lexical environment.

DevelopmentBeyond Frameworks: Practical DOM Manipulation Techniques for High-Performance UIs

Avnish Yadav – February 21, 2026 · 7 MIN READ

Beyond Frameworks: Practical DOM Manipulation Techniques for High-Performance UIs

Frameworks like React abstract the DOM, but they don't eliminate it. Master event delegation, document fragments, and state-syncing by building a vanilla JS engine from scratch.

EngineeringShipping Systems, Not Scripts: Announcing My 30-Day Production AI Challenge

Avnish Yadav – February 21, 2026 · 7 MIN READ

Shipping Systems, Not Scripts: Announcing My 30-Day Production AI Challenge

I’m done with 'Hello World' AI tutorials. For the next 30 days, I’m documenting the transition from experimental Jupyter Notebooks to deployed, scalable AI Agents. Here is the roadmap, the tech stack, and how you can get the exact template pack I’m building.

RetrospectiveSystem Logs: Monthly Growth Retrospective & The Metrics That Matter

Avnish Yadav – February 21, 2026 · 7 MIN READ

System Logs: Monthly Growth Retrospective & The Metrics That Matter

A raw, data-driven look at building an engineering brand. I break down this month's follower growth, GitHub activity, and lead generation, analyzing what code shipped and what strategies failed.

Career & BrandThe Feedback Loop: Turning Community Questions into Engineering Assets

Avnish Yadav – February 21, 2026 · 7 MIN READ

The Feedback Loop: Turning Community Questions into Engineering Assets

Most developers guess what to build. I let the community tell me. Here is how I turn repetitive questions into a content engine, a product roadmap, and a scalable FAQ system.

Content OpsThe Infinite Content Engine: How to Turn 1 Technical Blog Post into 10 Assets

Avnish Yadav – February 21, 2026 · 7 MIN READ

The Infinite Content Engine: How to Turn 1 Technical Blog Post into 10 Assets

Stop letting your technical writing die in the archives. Here is the engineering approach to content ops: a systematic repurposing map to turn one article into a month's worth of content across X, LinkedIn, and YouTube.

Dev LogWeekly Recap #4: The Art of Stress Testing and The Feedback Loop

Avnish Yadav – February 21, 2026 · 7 MIN READ

Weekly Recap #4: The Art of Stress Testing and The Feedback Loop

Week 4 wasn't about writing code—it was about breaking it. I opened the doors to feedback, analyzed the data, and pivoted for the final push. Here is the breakdown of the build, the metrics, and the brutal reality of shipping AI agents.

PortfolioArchitecting Intelligence: A Deep Dive into My Top 3 Automation Builds

Avnish Yadav – February 21, 2026 · 7 MIN READ

Architecting Intelligence: A Deep Dive into My Top 3 Automation Builds

A look under the hood of three complex systems I've engineered: a recursive content agent, a RAG-based legal assistant, and a real-time sentiment analysis engine. This is how I turn abstract problems into deployed solutions.