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Articles 124,026Blog Posts 130,263Tech Tutorials 31,848Research Papers 24,515News 17,876
⚡ AI Lessons
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
The Harness Stack
Ask five developers what an "agent harness" is and you will get five different answers. Some mean the...
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
When Vibe Coding Stops Working
Vibe coding is real, useful, and produces working software. It is also, past a certain point, a way...
Dev.to · Ian Johnson
🤖 AI Agents & Automation
⚡ AI Lesson
1mo ago
Code Review When Half the Diffs Are From Agents
Code review was invented for a world in which a human wrote each diff, slowly, and another human read...
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
The Pull Request as Checkpoint
The pull request has always been the place where every concern about a change converges. Tests run....
Dev.to · Ian Johnson
🤖 AI Agents & Automation
⚡ AI Lesson
1mo ago
AGENTS.md is Not a Junk Drawer
A rules file starts as one page. Six months later it is fourteen pages and nobody can remember what...
Dev.to · Ian Johnson
🏗️ Systems Design & Architecture
⚡ AI Lesson
1mo ago
Hexagonal Architecture in Practice: Ports, Adapters, and Tests That Skip the Database
This is the technical companion to a piece I wrote about cutting our CI from ~20 minutes to ~5. That...
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
How Hexagonal Architecture Cut My CI Time From 20 Minutes to 5
For most of the past year, our CI was a 20-minute ceremony. Push a branch, walk away, come back to...
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
Feature Flags That Forgot to Leave
A feature flag goes into the codebase to make a rollout safer. The new behavior lives behind the...
Dev.to · Ian Johnson
🤖 AI Agents & Automation
⚡ AI Lesson
1mo ago
The Minimum Viable Test Suite for Working with Agents
The advice "you need more tests" is correct in roughly the same way "you should eat better" is...
Dev.to · Ian Johnson
☁️ DevOps & Cloud
⚡ AI Lesson
1mo ago
Sensors and Guides: Two Ways Your Harness Talks to Your Agent
Birgitta Böckeler, writing about harness engineering at Thoughtworks, draws a distinction that turns...
Dev.to · Ian Johnson
☁️ DevOps & Cloud
⚡ AI Lesson
1mo ago
Don't Make the Agent Re-Run the Test Suite to Find the Failure
Here is a small failure mode that cost me time for longer than it should have. The agent would run...
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
The Five-Thousand-Line File
Every team has one. Sometimes it is called utils.ts or helpers.py. Sometimes it has the name of a...
Dev.to · Ian Johnson
🤖 AI Agents & Automation
⚡ AI Lesson
1mo ago
The Harness Flywheel: How Reviews Become Rules
The most expensive failure mode in an agent-augmented team is not the agent making mistakes. It is...
Dev.to · Ian Johnson
🔧 Backend Engineering
⚡ AI Lesson
1mo ago
When the Docs Lie
There is one thing worse than a codebase with no documentation: a codebase with documentation that...
Dev.to · Ian Johnson
🤖 AI Agents & Automation
⚡ AI Lesson
1mo ago
Why AI Agents Love Boring Code
The most useful thing you can do for your coding agent is not a better prompt or a smarter model....
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
The Code Nobody Will Delete
At the bottom of every long-lived codebase is a function nobody has called in three years. Above it...
Dev.to · Ian Johnson
⚡ AI Lesson
1mo ago
Post-mortems and RCAs: why you should be doing them
The hard part of incidents isn't surviving them. It's making them count. Most teams handle the acute...
Dev.to · Ian Johnson
🤖 AI Agents & Automation
⚡ AI Lesson
1mo ago
Continuous Delivery and Agents
There's a moment in every team's adoption of coding agents where the question shifts from "can it...
Dev.to · Ian Johnson
📋 Product Management
⚡ AI Lesson
1mo ago
Custom behavior without custom code
Every successful SaaS product eventually meets the same question: a customer asks for something...
Dev.to · Ian Johnson
⚡ AI Lesson
2mo ago
It werks!
Someone on your team says "it works" and there's a moment of relief, maybe even satisfaction. The...
Dev.to · Ian Johnson
🔐 Cybersecurity
⚡ AI Lesson
2mo ago
Credentials in web applications: how to store them properly
Almost every breach you read about in the news involves credentials. Sometimes it's passwords pulled...
Dev.to · Ian Johnson
🤖 AI Agents & Automation
⚡ AI Lesson
2mo ago
Automated tests are required now
Many teams still test their software by having a person click around in a staging environment and...
Dev.to · Ian Johnson
⚡ AI Lesson
2mo ago
Harness Engineering Is the New Software Engineering
For most of computing history, "software engineer" meant one thing: a person who writes code. You sat...
Dev.to · Ian Johnson
🧠 Large Language Models
⚡ AI Lesson
2mo ago
I keep getting the same pushback: "harness engineering isn't real engineering; you're just typing words at a model." I disagree, and I finally wrote down why.
Harness Engineering is REAL Engineering ...
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