Stop Prompting. Start Directing.
The Ultimate AI Engineering Course.
The first AI engineering course built around how senior engineers actually think. Not how to use tools, but how to build systems that make AI reliable, repeatable, and impossible to break.
Adrian Hajdin
Founder and CEO of JS Mastery
For over a year, we've been working on something very special just for you. I've never been this excited before, and I'm confident JS Mastery Pro is going to take your learning journey to the next level.
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What You Get
In your inbox in 60 seconds
The 9-File Context System
Nine files that give AI complete context before it writes a single line. The exact system used to build every JS Mastery project.
5 Agent Skills
Open source skills that enforce engineering thinking at every stage of the build. Install them today and start directing AI like a senior engineer.
The Methodology PDF
A practical guide to the skills and the workflow behind them. Everything you need before the course drops.
The course builds on all of this. One signup: materials now, early access later.
Built for the tools you already use:
Claude
Gemini
AI Studio
Codex
V0
The Problem
The pattern every dev hits.
- 01
The first hour always works.
You open the tool, type a prompt, the code looks clean. Features come together fast. Then around feature five, something breaks. You ask AI to fix it. Something else breaks. You're now spending more time untangling than building.
- 02
More prompting doesn't fix it.
The instinct is to write longer prompts, add more detail, re-explain everything. But the problem isn't the prompt. It's that AI has no architecture to anchor to. It's been guessing since session one, and early guesses compound.
- 03
The tool didn't fail you. You didn't have a system.
Every developer who's hit this wall blames the AI. But the developers shipping real products with AI aren't prompting better. They're thinking differently before the first prompt is ever sent.
zsh — project-x — 80×28
# Session 1 — everything is fine
✓feat: user login working
✓feat: dashboard renders
✓feat: data fetching ok
# Session 3 — things drift
⚠feat: stripe integration... kinda
⚠refactor: moved auth (why?)
# Session 5 — chaos
✗ERROR: Cannot read props of undefined
✗ERROR: auth middleware bypassed
✗ERROR: db writes not using server actions
✗FATAL: inconsistent state across 6 files
# You: "why did you change this?"
⚠AI: "I thought it would be better..."
$
CLAUDE.md
Live# Project: Ghost AI
Stack: Next.js · PostgreSQL · Claude
## Invariants
- - never bypass auth middleware
- - all writes go through server actions
- - ui state derives from server state
## Loop
$ /architect add streak system
→ spec.md updated · 3 invariants checked
$ build
✓ 4 files · 0 invariants broken
$ /review
✓ diff matches spec · shipping
The Engineering Loop
Not prompts. Skills.
Inside Claude Code, Cursor, or Codex, you don't type wishes. You invoke a disciplined loop the agent has to follow. Architect, build, review, ship, recover. Every project, every session, every time.
Scope the change against invariants before a single line is written
Diff against the spec, not the vibe. Catch drift before it ships
Recompose context when the agent drifts. Get back on track fast
What's Inside
The full curriculum
One production application built from scratch inside the course using every system taught across all 8 modules.
Everything you need before the first real lesson. Who this course is for, what you'll walk away with, and how to get the most out of it.
This course is for you if
You're a developer who already knows how to build
You've used AI coding tools and hit the wall where output stops being reliable
You're tired of rebuilding sessions from scratch because context drifted
You want to ship production software without a team, not just demos
You think in systems, not in prompts
This course is not for you if
You're brand new to programming
You're looking for a tool walkthrough or feature tutorial
You want someone to show you how to vibe code faster
You need hand-holding on basic JavaScript or React
Who's Teaching This
Built by someone who actually ships with it.
Adrian Hajdin is the founder of JavaScript Mastery, one of the most-followed developer education channels on YouTube with over 1 million subscribers. Every major project JSM has shipped in the last year, including the platform you're reading this on, was built using the exact methodology this course teaches.
This isn't a course built from documentation. It was built from the real experience of developing Ghost AI, a full Duolingo clone with real-time AI voice teachers, and dozens of other production applications, all using Claude Code and the agentic workflow at the center of this curriculum.
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Trustpilot Rating
2,900+
Student Reviews
10+
Production AI Projects
jsmastery.com
3x GitHub Star
Speaker at GitNation
1M Devs Helped
Conference Speaker
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