AntJanus · Case FilesBoulder, Colorado · Est. 2012File 001 · Home
Full StackAntonin
Antonin Januska in a black cap and glasses in front of a graffiti brick wall
Subject, Boulder CO

Subject profile · File AJ-2012

Active
Subject
Antonin Januska
Alias
AntJanus
Occupation
Staff Engineer · technical writer
Last seen
Boulder, Colorado
Known for
AI workflows and the craft of building things

Statement on record

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

Start here

Three files to read first

Hand-picked from the archive.

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.

AI Workflows · Jul 9, 2026

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.

AI Development · Jul 9, 2026

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 · Aug 14, 2026

Open cases

AI & Machine Learning

Workflows, tools, and experiments

View all →
Case AI-260814

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.

Keywords: AI, Claude Code, CSS, UI
New
Case AI-260709

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.

Keywords: ai, claude-code, local-first, side-projects
Case AI-260709

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.

Keywords: ai, claude-code, skills, architecture, local-first
Case AI-260227

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.

Keywords: fiction, I, AI series
Fiction
Case AI-260227

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.

Keywords: AI, Claude Code, productivity

Field notes

Digital Garden

Engineering, opinions, and deep dives

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Case DG-260223

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.

Keywords: ai, claude-code, side-projects, programming
Featured
Case DG-260108

The Simplest CSS Grids

Learn the most common CSS Grid layouts with copy-pastable examples for two-column layouts, sidebar navigation, and more.

Active leads

AI Experiments

Projects, tools, and creative AI work

Lead · Service

AI Workflow Consulting

Helping companies implement AI tools and processes effectively

Claude, LLMs, Prompt Engineering
Lead · Article

AI Glossary

Comprehensive glossary of AI terms and concepts

Lead · Experiment

I, AI - Short Stories

Science fiction exploring AI themes and futures

Creative Writing, AI

Projects

Work With Me

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

Get in touch →