free book · spec-driven development
The spec is the memory your agent doesn't have.
Spec-Driven Development, from the method to production: what shipped a 13-app crypto fintech in 70 days, solo.
what's in the book
From the method to code, spec by spec.
169 pages, PDF and EPUB, built on a real project from scratch: TaskFlow Pro.
01
Requirements, design, tasks
Specs in EARS format, with an approval gate between phases.
02
Templates and a Claude Code kit
requirements.md, design.md and tasks.md, plus the /sdd-* skills, open on GitHub.
03
The case, and the alternatives
The 13-app case in numbers, SDD for teams, and how it compares with GitHub Spec Kit and Kiro.
the author
Felipe Fontoura
AI Engineer. 25 years in production, 13 apps in 70 days with AI agents, 30k students trained.
25+
years shipping production
13 apps
in 70 days, solo
30k+
students trained
shipped production at
INPEEMBRAERSOLVAYTUI GROUPIFOOD