# Back-Cover Copy — 42: The AI Builder's Stack

_Final copy as set on the printed jacket. Cover art: FINAL._

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**Artificial intelligence is no longer a tool for specialists.
It is becoming the operating system for modern organizations.**

Yet most teams never move beyond experimentation. They write prompts, test chatbots, automate a few tasks, and wonder why transformation never arrives.

*42: The AI Builder's Stack* provides a practical framework for understanding how AI capabilities build on one another, from foundational prompting to workflows, automation, knowledge systems, agents, and organization-wide transformation. Rather than focusing on fleeting tools or today's trends, it equips practitioners with enduring principles for designing systems that create lasting value.

Whether you're an executive, product leader, consultant, founder, or technical builder, this guide will help you separate genuine opportunities from hype, understand where each layer of the AI stack fits, and make better decisions as the technology continues to evolve.

The future won't belong to the organizations with access to the most AI tools. It will belong to those who know how to connect them into systems that learn, scale, and compound.

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**Dennis Vorobyov** is the CEO and co-founder of EltexSoft, a boutique software engineering studio with teams in the United States, Portugal, and Ukraine. By mid-2023 he had reworked about 90% of the company's workflows around AI. This book is what he learned.

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Sub-Etha Press · Books for Builders · subethapress.com