[ AI ENGINEER ]with Johannes Hayer

Let AI do everything?
You'll understand nothing.

People who understand AI will be in demand — because it's hard. I teach the concepts behind it.

Johannes Hayer, The AI Engineer — portrait

6+ Years Industry Experience · AWS & Azure Certified · Fullstack AI Engineer

[ Click through ]

Looks great.

AI built your chatbot. The demo works.

[ The shift ]

AI is a powerful tool.

Used right, it multiplies you. Used wrong, it replaces the part of you that companies actually pay for.

Two directions

Outsource everything

  • Think less yourself
  • Question less
  • Understand less

Obsolete. You stop delivering value.

Understand and question

  • Grasp the concepts
  • Think critically
  • Use tools on purpose

More in demand than ever.

Understand instead of outsource — start with free Basic membership.

[ The flywheel ]

How?

Five assets that build understanding.

You don't win by using less AI. You win by understanding more. Each asset pulls you from prompting to engineering — and they reinforce each other.

The AI Engineer

From dependency to depth.

Courses & Blog

Concepts, not hacks

Learn why systems work — so you can explain what you built in any interview.

Starter Kits

Real boilerplates

Build production systems yourself — not demos you prompted into existence.

Community

Direct access

Gold includes a monthly live call — bring one concrete question about what you are building.

AI-in-a-Shell

Your AI tutor

AI that teaches and challenges you — instead of doing the thinking for you.

Knowledge Graph

Your second brain

Connect concepts across everything you learn — so understanding compounds.

[ Who guides you ]

6 years in industry. Then I made the transformation myself.

I was afraid of becoming obsolete — so I went from Cloud Architect to AI Engineer. I show you exactly what matters and what's actually in demand.

Today I have a well-paid AI engineer job — but only because I built and understood new things on the side of my day job. I want to help you do the same.

Engineers get paid to solve problems. How are you going to do that if you don't understand the concepts?

Concepts learned — not outsourced

Johannes Hayer, The AI Engineer — portrait

AWS

AI Practitioner

Early Adopter · 2025

Microsoft

Azure AI Fundamentals

2024

Hugging Face

AI Agents Fundamentals

2025

AWS

Solutions Architect

2022

AWS

Developer Associate

2022

[ START HERE ]

See how I teach — for free.

Others sell Masterclass-level content and MCP courses. Mine are free — Lesson 1 needs no account, the rest unlocks with free Basic.

Try first, then commit. Basic membership is free — one login, your email in the system, full depth unlocked.

[ AI Engineering for Builders ]

My mental model — in six parts.

Six articles that build my AI engineering mental model — principles, not prompt tricks. Free to read, no account needed.

Part 1Start hereai-engineeringmental-modelai-engineering-for-buildersJun 15, 202610 min

The AI Engineering Mental Model

AI engineering isn't ML engineering and it isn't "call the API with a good prompt." It's building reliable applications on top of probabilistic foundation models — and the most important shift is that LLMs are not functions.

Part 2ai-engineeringmodelsai-engineering-for-buildersJun 17, 202610 min

Models as Probabilistic Infrastructure

The model you call today was trained on different comparison data than the one you called three months ago. Post-training, sampling, and structured outputs — and why the same prompt returns different answers.

Part 3ai-engineeringevaluationevalsJun 19, 202614 min

Evaluation First

Evaluation is the hardest problem in AI engineering and where most teams invest the least. Three methods — exact match, AI-as-judge, comparative — and how to build an eval pipeline that makes quality measurable.

Part 4ai-engineeringpromptingcontext-engineeringJun 22, 202610 min

Prompt and Context Engineering

A prompt is a specification, not a command. System vs user prompts, in-context learning, chain-of-thought, the context window as a constrained resource, and defensive prompt engineering against injection and extraction.

Part 5ai-engineeringproductionarchitectureJun 29, 202612 min

Production AI Architecture

A demo is a solved problem. Shipping something that works reliably for a thousand users a day is a different engineering problem. Five production patterns — guardrails, context enhancement, model routing, caching, agents — and the monitoring loop that makes AI systems improve over time.

Part 6ai-engineeringragfinetuningJun 25, 202610 min

RAG vs Finetuning — The Decision Framework

The most common question in AI development, answered with a decision tree. When to use RAG, when to finetune, why most finetunes don't work — and the three conditions that justify trying. PEFT and LoRA as the practical entry point.

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AI engineering, weekly.

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