Antonin Januska · Staff Engineer · Boulder
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.
Start here
Three pieces I would hand you first.
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 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 & Machine Learning
Workflows, tools, and experiments
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AI · CSS
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.
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Local-first
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.
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Skills
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.
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Opinion
An Honest Opinion on the State of Code Gen AI, Spring 2026 Edition
A frank assessment of where code generation AI actually stands in 2026 -- from agentic harnesses to multi-agent architectures and what still needs to change.
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Story
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.
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Claude Code
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.
Digital Garden
Engineering, opinions, and deep dives
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Featured
17 Side Projects I Built With Claude Code in Two Months
A 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.
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Popular
Common React Hooks Antipatterns and Gotchas
Learn about common React Hooks antipatterns and how to avoid them for better code quality.
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Popular
The Simplest CSS Grids
Learn the most common CSS Grid layouts with copy-pastable examples for two-column layouts, sidebar navigation, and more.
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TypeScript
Constants vs Enums in TypeScript
TypeScript tips and tricks
The best code is no code at all.
— from Programmer's Proverbs
AI Experiments
Projects, tools, and creative AI work
AI Workflow Consulting
Helping companies implement AI tools and processes effectively
Claude, LLMs, Prompt Engineering ArticleClaude Code Best Practices
Guide to effective AI-assisted development
Claude Code, TypeScript ArticleAI Glossary
Comprehensive glossary of AI terms and concepts
Reference ExperimentI, AI - Short Stories
Science fiction exploring AI themes and futures
Creative Writing, AIElsewhere
Projects
- Programmer's Proverbs 600+ stars
- YouTube Channel AI & Dev
- Cottage UI React Library
Work with me
I help companies implement AI workflows and accelerate their development teams.