# How GenAI works — Through the eyes of an Engineer | Practical Pocket Guide

> Source: <https://pub.towardsai.net/how-genai-works-through-the-eyes-of-an-engineer-practical-pocket-guide-e63eaf721841?source=rss----98111c9905da---4>
> Published: 2026-07-26 11:50:47+00:00

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# How GenAI works — Through the Eyes of an Engineer |Practical Pocket Guide

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*This is how an **LLM actually works — end to end, no any mysticism!*

*By the end you’ll know what a “**context window**” really is, why “** tokens”** cost you money, and what people mean when they call the model a “**black box**”.*

I have been absent for some time from **“ sharing my ideas”** — the way I see the

**Information Technology** world through the eyes of an

**Engineer**.

**The reason?** I went deep to build my skillset even further in a domain that is literally growing inside me right now, and I want to share part of that journey with you in this moment!

*Everyone around me will admit it:*

I am an engineer who stays

relentlessly curiousabout how the world works and how everything is“glued together”— a phrase I use often in my day-to-day work and life.

Even though I occasionally feel pure *“**awe**”** *about where we stand technologically, I still see and compare the world around me as an engine.

Patterns and systems mechanically…