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Sub-Etha Press · Books for Builders

42 The AI Builder’s Stack

From First Prompt to Full Transformation. A Practitioner’s Guide.

The exact stack one software studio uses to run a real business with AI at every layer. Twenty-two chapters, each from absolute zero to deeper than most paid courses, written by the CEO who reworked 90 percent of his company’s workflows around AI and kept what survived. No sponsors. No affiliate links. No reason to be nice about any product.

Kindle $9.99 · Paperback $24.99 · Hardcover $39.99 · 396 pages

42: The AI Builder’s Stack, front cover

Once you build with AI, the old way stops making sense.

Introduction

Inside the book

Six parts. Twenty-two chapters. Zero to deep on each.

Every chapter begins from absolute zero and goes deep. Skip what you know. Dive into what you don’t.

From the introduction

VI The Big Picture

The guerrilla guide to aifying your organization – without hiring a Chief AI Officer.

Chapter 21 · AI Transformation for Small Teams

  1. 20 Chinese vs US AI Models 287
  2. 21 AI Transformation for Small Teams 301
  3. 22 Who to Follow 317
V The Agent Era

Agentic workflows are the most powerful and most overhyped capability in AI development right now.

Chapter 17 · Agentic Workflows

  1. 17 Agentic Workflows 249
  2. 18 OpenClaw + Composio 263
  3. 19 Voice AI 275
IV Leveling Up

The most powerful AI extension you’ll ever build is a Markdown file.

Chapter 13 · Claude Skills

  1. 12 MCP vs API 183
  2. 13 Claude Skills 197
  3. 14 OpenRouter 211
  4. 15 Playwright 223
  5. 16 CodeRabbit 237
III Building Your First Project

The blank screen is closer to the live site than ever. The distance that remains is taste, review, and security. Those are human skills. They always will be.

Chapter 11 · Building a Website from Scratch

  1. 8 Writing PRDs 109
  2. 9 Supabase 131
  3. 10 Vercel and Render 149
  4. 11 Building a Website from Scratch 163
II The Developer’s Toolkit

Your AI engineer lives in the terminal now.

Chapter 6 · Claude Code

  1. 4 Warp 51
  2. 5 GitHub 63
  3. 6 Claude Code 79
  4. 7 AI-Powered IDEs, Harnesses, and Your Dev Environment 93
I Your First Day with AI

Claude is the most brilliant employee you’ve ever hired, with total amnesia at the start of every conversation.

Chapter 1 · Talking to Claude

  1. 1 Talking to Claude 3
  2. 2 NotebookLM & AI Research Tools 21
  3. 3 Obsidian 33

Plus a prologue, an epilogue, a 16-page glossary, and 47 pages of notes and sources.

Who it’s for

Non-technical founders and CEOs who want to stop depending on others for every small task and be dangerous enough to prototype their own ideas.

Developers and engineers who have used Copilot or ChatGPT casually and have not assembled the full AI-augmented workflow: terminal, IDE, version control, database, deployment, testing, review, agents.

Product managers, operators and consultants who work with technical teams and want to know what their engineers are actually using, and why.

Small team leaders who want to aify how their organization works without a Chief AI Officer, a six-figure engagement, or a formal AI strategy. Chapter 21 is for you.

Anyone tired of listicles who has read the top-ten-tools articles and still does not know where to start.

Praise

“I feel like this book is the 2026 guide to going from zero to a human supercomputer.”

Riley Davidson

Engineering Manager at Instacart

“A hands-on guide that speaks the language of real developers building real systems.”

Richard Cave

Senior Software Engineer at VSCO, formerly Engineering Manager at Apple

“For founders who want to stop playing with AI and start building. You’ll learn which tools matter, where they break, and what still shouldn’t be delegated.”

Ivan Bercovich

Operating Partner, ScOp Venture Capital

“A rare book for two readers at once: it makes non-coders dangerous enough to prototype, and gives coders a fast on-ramp to AI-native building.”

Ben Fisher

AI Product & Engineering at SKINNY&bald

Three ways to read

42: The AI Builder’s Stack, Kindle edition

Kindle

$9.99

ISBN 979-8-950624-02-5

Buy on Amazon
42: The AI Builder’s Stack, paperback edition

Paperback

$24.99

ISBN 979-8-950624-01-8

Buy on Amazon
42: The AI Builder’s Stack, hardcover edition

Hardcover

$39.99

ISBN 979-8-950624-00-1

Buy on Amazon

All three editions are sold by Amazon. The text is identical.

Dennis Vorobyov
Dennis Vorobyov

About the author

Dennis Vorobyov

Dennis Vorobyov is the CEO and co-founder of EltexSoft, a boutique software engineering studio he built from scratch in 2015 to a team of 35–50 engineers. EltexSoft has shipped 100+ projects for clients from early-stage startups to Fortune 500 enterprises, with teams in the United States, Portugal, and Ukraine.

He moved his family to Lisbon and reorganized operations while Russia’s full-scale war on Ukraine was ongoing in 2022. By mid-2023 he had reworked about 90% of the company’s workflows around AI. 42: The AI Builder’s Stack is what he learned — a practitioner’s framework for how AI capabilities build on one another, from the first prompt to organization-wide transformation.

This is his first book. He is already behind schedule on the second and third ones.

From the back matter

eltexsoft.com

42: The AI Builder’s Stack, spine

The builder’s stack was the right place to start.

What’s Next, p. 396