Field journal ofAntonin Januska
Sta. 00 · Base camp40.0150° N · 105.2705° WElev. 5,328 ftLogged 2026-09-29
Field journal · Vol. 14 · since 2012

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.

Years building
20+
GitHub stars
600+
Blogging since
2012
Antonin in a black cap and glasses in front of a graffiti brick wall
Fig. 1 — the observer, Boulder, CO
Entry 01

Start here

Three specimens worth reading first.

Full catalog →
Start here
Pl. AI-2026-11
Cat. AI-2026-11
Habitat · AI

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
  • claude-code
  • local-first
  • side-projects
Pl. AI-2026-10
Cat. AI-2026-10
Habitat · AI

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
  • claude-code
  • skills
  • architecture
Pl. AI-2026-12
Cat. AI-2026-12
Habitat · AI

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
  • claude-code
  • css
  • ui
Entry 02

AI & Machine Learning

Workflows, tools, and experiments.

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  1. Cat. AI-2026-12
    AI

    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.

  2. Cat. AI-2026-11
    AI

    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.

  3. Cat. AI-2026-10
    AI

    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.

  4. Cat. AI-2026-09
    AI

    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.

  5. Cat. ST-2026-03
    I, AI stories

    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.

  6. Cat. AI-2026-08
    AI

    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.

Entry 03

Digital Garden

Engineering, opinions, and deep dives.

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Pl. DG-2026-11
Cat. DG-2026-11
Habitat · Digital Garden

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.

  • ai
  • claude-code
  • side-projects
  • programming
Pl. DG-2026-10
Cat. DG-2026-10
Habitat · Digital Garden

Common React Hooks Antipatterns and Gotchas

Learn about common React Hooks antipatterns and how to avoid them for better code quality.

Pl. DG-2026-09
Cat. DG-2026-09
Habitat · Digital Garden

The Simplest CSS Grids

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

Pl. DG-2024-08
Cat. DG-2024-08
Habitat · Digital Garden

Constants vs Enums in TypeScript

TypeScript tips and tricks

Entry 04

AI Experiments

Projects, tools, and creative AI work.

Instruments →
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

Signal

Connect

Collection

Projects

Expeditions for hire

Work With Me

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

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