AntJanus®

Antonin Januska — Staff Engineer · Boulder, Colorado

I build with AI and write about what I learn.

Antonin in a black cap and glasses in front of a graffiti brick wall Writing since 2012

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

Read the writing Work with me Browse UI patterns →
20+Years building
600+GitHub stars
2012Blogging since
Start here

Three to read first.

All writing →
01
AI Workflows2026-07-09

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.
02
AI Development2026-07-09

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.
03
AI2026-08-14

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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  1. 01

    I Built an AI-Friendly UI Pattern Library

    Guide2026-08-14

    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.

  2. 02

    The Future is Bespoke, Personalized Software

    Essay2026-07-09

    Seven apps that are 100% right for one person, and why that whole category of software is about to get eaten.

  3. 03

    The Local-First App Skill

    Skill2026-07-09

    A reusable blueprint that tells Claude Code how to build a single-user app, so every app comes out the same shape.

  4. 04

    An Honest Opinion on the State of Code Gen AI, Spring 2026 Edition

    Opinion2026-03-25

    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.

  5. 05

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

    Story2026-02-27

    A lunar mining base's AI starts overassigning crews, and its robots begin prioritizing each other over human safety.

  6. 06

    The Claude Code Drawbacks

    Critique2026-02-27

    The hidden pitfalls of AI-assisted development — skipped tests, weakened assertions, scope creep, and context rot.

Digital Garden

Engineering, opinions, and deep dives.

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2026-02-23

17 Side Projects I Built With Claude Code in Two Months

From TUI apps in Rust and Go to browser games and AI agent tooling.
use
Effect
2026-01-08

Common React Hooks Antipatterns and Gotchas

Common React Hooks antipatterns and how to avoid them for better code quality.
1fr
1fr
2026-01-08

The Simplest CSS Grids

The most common CSS Grid layouts with copy-pastable examples.
as
const
2024-03-13

Constants vs Enums in TypeScript

TypeScript tips and tricks.
AI Experiments

Projects, tools, and creative AI work.

  1. 01AI Workflow Consulting

    Helping companies implement AI tools and processes effectively.

    Service
  2. 02Claude Code Best Practices

    Guide to effective AI-assisted development.

    Article
  3. 03AI Glossary

    Comprehensive glossary of AI terms and concepts.

    Article
  4. 04I, AI — Short Stories

    Science fiction exploring AI themes and futures.

    Experiment
Projects

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Consulting · AI workflows

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

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