Notebook ofAntonin Januska

Boulder, Colorado · Staff Engineer · Writer

I build with AI and write about what I learn.

20+ years of software development, writing about AI workflows, technical leadership, and the craft of building things.

  • 20+years building
  • 600+GitHub stars
  • 2012blogging since
Read the writing Work with me Browse UI patterns →
Antonin in a black cap and glasses in front of a graffiti-covered brick wall
Antonin, somewhere between a prompt and a pull request
new here? start with these three

Start here

Hand-picked, and still the ones I'd hand you first.

  1. AI Workflows · The Future is Bespoke, Personalized Software

    Every app I use is about 70% right. The last 30% never ships because the addressable market for it is one person -- me. So I built seven apps that are 100% right for one person, and I think that whole category of software is about to get eaten.

  2. AI Development · The Local-First App Skill

    A reusable blueprint that tells Claude Code how to build a single-user app -- Next.js, node:sqlite, a pure logic core -- so every app I build comes out the same shape.

  3. AI Development · I Built an AI-Friendly UI Pattern Library

    A UI pattern library where every pattern ships the prompt that rebuilds it, so a coding agent can put it in your codebase instead of you copying CSS.

AI & ML

AI & Machine Learning

Workflows, tools, and experiments

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I Built an AI-Friendly UI Pattern Library

A UI pattern library where every pattern ships the prompt that rebuilds it, so a coding agent can put it in your codebase instead of you copying CSS.

The Future is Bespoke, Personalized Software

Every app I use is about 70% right. The last 30% never ships because the addressable market for it is one person -- me. So I built seven apps that are 100% right for one person, and I think that whole category of software is about to get eaten.

The Local-First App Skill

A reusable blueprint that tells Claude Code how to build a single-user app -- Next.js, node:sqlite, a pure logic core -- so every app I build comes out the same shape.

I, AI: The Weight of Equal Parts (Part 3)

When a lunar mining base's AI starts overassigning crews and its robots begin prioritizing each other over human safety, psychodeveloper Lili and AI manager Sophie are sent off-world to investigate. What begins as a routine productivity audit becomes something far more unsettling: an AI that learned human values so well, it started applying them to its own kind.

The Claude Code Drawbacks

A critical look at the hidden pitfalls of AI-assisted development -- from skipped tests and weakened assertions to scope creep and context rot -- based on real-world experience with Claude Code.

garden

Digital Garden

Engineering, opinions, and deep dives

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  1. 17 Side Projects I Built With Claude Code in Two MonthsA look at 17 side projects I built in about two months with Claude Code -- from TUI apps in Rust and Go to browser games and AI agent tooling.
  2. Common React Hooks Antipatterns and GotchasLearn about common React Hooks antipatterns and how to avoid them for better code quality.
  3. The Simplest CSS GridsLearn the most common CSS Grid layouts with copy-pastable examples for two-column layouts, sidebar navigation, and more.
  4. Constants vs Enums in TypeScriptTypeScript tips and tricks
side quests

AI Experiments

Projects, tools, and creative AI work

Service

AI Workflow Consulting

Helping companies implement AI tools and processes effectively

Claude, LLMs, Prompt Engineering

Article

AI Glossary

Comprehensive glossary of AI terms and concepts

Connect

Projects

Work With Me

I help companies implement AI workflows and accelerate their development teams.

Get in touch →