[2001]2026.06.07
bookThe Stacktube Companion
A book made instead of a manual. Essays on how to use Stacktube — and the decisions behind it. Companion 1.1.
typecompanion
formatEPUB, PDF
pricefree
version1.1 · 2026-07
live
Every Wrong Turn, Logged
89 work sessions. 288 commits. One full rebuild after weeks of work had to be thrown away. Zero sign-ups on the day it launched.
The author had never opened a terminal before this project began. This is the record of how the build got done anyway, in the order it happened, with the wrong turns left in.
Who it's for
Written for people who want to build something and do not write code: solo founders, designers, marketers, writers, and anyone who has opened an AI coding tool and not known what to type first.
If you already write code for a living, this will feel slow. The book stops to explain things you settled years ago.
Read it straight through, or jump to the chapter where you are stuck. Each chapter is written to stand on its own.
Contents
- Part 0 — Prologue
- Part 1 — Planning: Decisions Before You Build
- Ch.1 Does This Actually Need to Be "Built"?
- Ch.2 Turning an Idea into a Business Model
- Ch.3 Choosing Your Tech Stack
- Ch.4 Choosing Your AI Coding Tools
- Part 2 — Design: The Document Comes Before the Code
- Ch.5 The Art of Managing AI
- Ch.6 The Staged Build Strategy
- Part 3 — Build: What Actually Happens
- Ch.7 Day 1: The Reality of Starting a Project
- Ch.8 Making Friends with Errors: Red Text Is a Clue, Not a Catastrophe
- Ch.9 The Hidden Traps of External Integrations
- Ch.10 Deployment: From Your Machine to the World
- Part 4 — Launch: The First Step of the Voyage
- Ch.11 Building It and Selling It Are Different Problems
- Part 5 — Operations: Keeping the Boat Afloat
- Ch.12 Operations Monitoring & Incident Response
- Ch.13 Analyzing User Data & Making Decisions
- Ch.14 Security & Legal Basics
- Ch.15 Scaling in Practice: 100 → 1,000 → 10,000
- Part 6 — Notes from Departure Day: What to Write Down Before the Voyage Begins
- Ch.16 The Reality of Maintenance
- Ch.17 The Non-Developer Builder's Mindset
- Appendix
Appendices A to J
Side-by-side comparisons of AI coding tools, models, payment providers, and hosting, with the reasons each one was picked or dropped. The design documents the author wishes he had written first, as blank templates. Checklists for pre-launch, launch day, and the first week after, plus a glossary and command cards.
About the author
unstackd is a one-person software studio in Seoul, run by Bumjin Cho.
Until the spring of 2026, Bumjin had never opened a terminal. Working evenings and weekends with AI coding tools, he built and launched Stacktube, a service that turns new videos from the YouTube channels you follow into structured notes. He wrote down every decision along the way, including the wrong turns, and that record became Ship It.
He lived in Japan for more than ten years and now works in Korean, Japanese, and English. The Japanese edition of the book is 非エンジニアの航海日誌.