AI Writes the Code.
You Design the System.

From prototype to production. The 10% between a demo and a product.

Get the Launch Bundle - $399

Course only - $199 · Community only - $49/month

The Challenge

The Missing Piece

You've built prototypes. Maybe impressive ones. 10-minute demos that actually work.

But when you try to go further:

The codebase becomes a maze
Unexpected breaking change
Rework code surge due AI slop
You loose time on complex tasks

There's nothing wrong with prototypes. Lovable, v0, Cursor... they're genuinely useful for getting started. But there's a gap between "it works on my machine" and "customers are paying for it."

Most developers keep prompting, hoping the next iteration will magically fix the architecture problems. It won't.

That's what DevX solves.

The Solution

The 90/10 Rule

AI gets better at the 90% every month. The 10% is still yours to figure out.
This is what I teach dev teams. It works.

The Four Pillars

Specifications

"The agent keeps misunderstanding me"

Learn the Explore → Plan → Execute workflow.
Clear instructions, predictable results.

Agentic Setup

"I spend more time configuring than coding"

One-time setup that pays off every session.
Sandbox, hooks, memory that actually helps.

Security

"It's always the others that getting hacked, write?"

Learn vulnerabilities and security by design to protect your environments.

System Design

"Every fix creates two new bugs"

Architecture patterns that scale with AI, not against it.
Observability and Evaluation are the cornerstone

The Method

How You'll Learn

Each lesson follows the same structure

1

Problem

What challenge are we solving?

2

Solution

How do we approach it systematically?

3

Example

Hands-on practice you can follow along

4

Best Practices

Pitfalls to avoid and patterns to adopt

Lessons designed to be completed in one sitting.

38 lessons 10-15 hours total Self-paced Lifetime access
Course Syllabus

5 Modules, 38 Lessons

01

Foundations

9 lessons

Why most AI projects fail - and what to do instead

  • → The 90/10 Rule: why the last 10% determines success
  • → LLMs as Pure Functions: tokens in, tokens out
  • → Context as a Finite Resource: why 1M tokens ≠ unlimited memory
  • → Prompt vs Context Engineering: beyond crafting prompts to managing information
  • → The Blind Spot Log: track what goes wrong to improve systematically
02

Agentic Setup

12 lessons

Configure your environment for controlled productivity

  • → Configuration & Multi-Profile Management: getting started right
  • → Memory Architecture: project memory, session context, persistent instructions
  • → Writing Effective Skills: reusable, scannable skill files
  • → MCP Servers & Security: connecting external tools safely
  • → Sandbox Configuration: OS-level isolation with sandbox-shell
03

System Design

5 lessons

Architecture decisions that scale with AI assistance

  • → Architecture Amplifies: why iterative AI loops magnify existing patterns
  • → AI-Native Project Structure: organize so Claude doesn't get lost
  • → Deterministic Beats Context Engineering: enforce behavior through architecture
  • → Choosing Your Stack: pick a stack where you can spot when Claude is wrong
  • → The Boilerplate Philosophy: production starters with encoded decisions
04

Specifications

8 lessons

The methodology for writing instructions that work

  • → Explore — Gather context before coding begins
  • → Plan — Review before executing, catch bad plans early
  • → Execute — Controlled implementation with incremental reviews
  • → Review & Debug — QA, tests, systematic troubleshooting
  • → System Prompt Architecture & Cache-Friendly Prompting
05

Security

4 lessons

DevSecOps for agentic development

  • → Risks of Agentic Development: destructive commands, data leaks, runaway agents
  • → OWASP Top 10 for LLM Applications: AI-specific security threats
  • → Guardrails Implementation: human-in-the-loop patterns that work
  • → Production Deployment Checklist: before you ship AI-assisted code
What You Get

Everything You Need

35 actionable lessons

Each one solves a real problem

Hands-on exercises

Practice with real scenarios

devx-plugins package

Production-ready commands and skills

Community of peers

Access on Circle.so

Lifetime updates

As Claude Code evolves

Your Guide

Your Instructor

PT

Pierre Tomasina

15+ years building and teaching production systems. DevSecOps, AWS architecture, software engineering.

I've coached dev teams, fixed architecture messes, and done the advisory calls that companies pay premium for. Now I'm packaging what works into a course.

"I teach the boring parts that actually matter."

What I teach is what I use. Every day.

Open Source

Built in the Open

The tools I teach with are the tools I build with. Open source, battle-tested, yours to use.

sandbox-shell (sx)

macOS sandbox CLI for secure development. Protect your credentials from malicious npm packages and supply chain attacks. Perfect for Claude Code agentic workflows.

View on GitHub

devx-plugins

Claude Code plugins curated from daily use. Conventional commits, PR automation, architecture diagrams. Not vibe-coded experiments - tools that survived hundreds of uses.

View on GitHub
Pricing

Simple Pricing

Best Value

Early Bird Bundle

Everything you need. Method + tools + ongoing support.

$299 one-time

$638 value · 53% off

  • 38 lessons
  • Ralph Loop Plugin
  • 1 year community access
  • Bi-weekly live sessions with Q&A
  • Gems of the Week deep dives
  • Private community (Circle)
  • Production boilerplates

Limited to first 20 members

Get the Bundle

DevX Course

Learn the method at your own pace.

$199 one-time

$139 for Community members

  • 38 lessons
  • Ralph Loop Plugin
  • Downloadable resources
  • Bi-weekly live sessions with Q&A
  • Gems of the Week deep dives
  • Private community (Circle)
  • Production boilerplates
Get the Course

Dev3o Community

Stay current with ongoing support.

$49 /month

Cancel anytime · $499/year

  • Bi-weekly live sessions with Q&A
  • Gems of the Week deep dives
  • Private community (Circle)
  • Production boilerplates
  • 30% off DevX Course
  • 38 lessons
  • Ralph Loop Plugin
Join the Community
What's Next

Ready for More?

The DevX course teaches the methodology. The Agentic SWE 3.0 Bootcamp teaches you to build the agents themselves.

6 weeks, cohort-based. Learn to build agentic systems like Lovable, Notion Agent, or your own AI-powered product.

What You Get

  • → Weekly live workshops: lecture + hands-on + code review
  • → NotionVibe case study: reverse-engineer a production agentic SaaS
  • → 1:1 System Design Sprint: personalized architecture + roadmap
  • → DevX Course + Ralph Loop plugin (keep forever)
  • → 1 year Dev3o Community subscription

This is for you if:

  • ✓ You've built prototypes but struggle scaling to production
  • ✓ You're tired of AI writing messy code you have to fix
  • ✓ You want to ship autonomous software, not one-off scripts

This is NOT for you if:

  • ✗ Just want to learn Claude faster (take DevX instead)
  • ✗ No idea what to build yet

$3,500 or $600/month × 6

First cohort Q2 2026 · Limited to 8-12 developers

Book a Call
Enterprise

Need This for Your Team?

Training multiple developers? Transforming how your team builds with AI? Let's talk.

Architecture Sprint

1-week intensive. Audit your stack, identify bottlenecks, deliver a roadmap and quick wins.

Team Training

4-8 weeks. Deploy AI dev practices, build internal tooling, upskill your team to operate independently.

Advisory Retainer

Ongoing strategic calls + async access. Architecture guidance without full-time commitment.

15+ years of DevSecOps, AWS architecture, and fixing messes other people made.
Every engagement is scoped to what you actually need.

Book a Discovery Call
FAQ

Frequently Asked Questions

Do I need prior experience with AI coding tools?
No. The course starts from fundamentals. You should be comfortable writing code in any language. That's the baseline. Module 2 gets you set up with Claude Code if you've never touched it.
Will this work with Copilot/AMP/OpenCode/other tools?
The principles transfer. Context engineering is context engineering, whatever tool you're using. I use Claude Code because it's the best fit for what I do. But if you're on Copilot, the patterns work. Just adapt the examples to your stack.
What's the difference between course and community?
Course is 38 lessons focus on Coding Agent, including an advanced Ralph Loop plugin. Community is for building Agentic stuff: live sessions, weekly Gems, access to private discussions, boilerplates we're building in production. They're separate products. Community members get 30% off the course.
Can I add the community after buying the course?
Yes. Subscribe at $49/month whenever you're ready. The course is yours forever either way.
What's in the Early Bird Bundle?
DevX Course ($139) + 1 year Community ($499) for $299. That's 53% off. Limited to the first 20 people. It's the best deal if you want the whole thing.
What if I'm already experienced with AI coding?
Modules 3-5 cover the hard parts: system design, specifications methodology, security patterns. Most "experienced" developers have gaps they don't know they have. The structured approach fills them. Worth it.
How long do I have access?
Course: lifetime. Community: as long as you're subscribed. No artificial expirations either way.
Can I get a refund?
Bootcamp: yes, cancel anytime in the first two weeks and you're done. Course: no. It's immediate digital delivery—you get the modules, ralph-loop and boilerplate github repo access the second you buy it. Know what you're buying.

Ready to Ship?

From prototype to production. From "it works" to "customers are paying."

Get the Early Bird Bundle - $299

Or course only - $199 · community only - $49/month

AI writes the code. You design the system.