ANTJANUSantonin januska

Antonin Januska · Staff Engineer · Boulder, Colorado

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 brick wall
FIG.00 me-3-cropped.jpg

01Start here

Three pieces that explain what this site is about.All writing →

Illustration for The Future is Bespoke, Personalized Software
future-is-bespoke-personalized-software.png
2026-07-09 · AI WorkflowsThe Future is Bespoke, Personalized SoftwareEvery 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.Read →
Illustration for The Local-First App Skill
local-first-app-skill.png
2026-07-09 · AI DevelopmentThe Local-First App SkillA 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.Read →
ai-friendly-ui-pattern-library.webp
2026-08-14 · AII Built an AI-Friendly UI Pattern LibraryA 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.Read →

02AI & Machine Learning

Workflows, tools, and experimentsView all →

  1. 2026-08-14I Built an AI-Friendly UI Pattern LibraryA 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
  2. 2026-07-09The Future is Bespoke, Personalized SoftwareEvery 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
  3. 2026-07-09The Local-First App SkillA 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 · skills · architecture
  4. 2026-03-25An Honest Opinion on the State of Code Gen AI, Spring 2026 EditionA frank assessment of where code generation AI actually stands in 2026 -- from agentic harnesses to multi-agent architectures and what still needs to change.AI · Claude Code · productivity
  5. 2026-02-27I, 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.story · I, AI
  6. 2026-02-27The Claude Code DrawbacksA 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.AI · Claude Code · productivity

03Digital Garden

Engineering, opinions, and deep divesView all →

  1. 2026-02-2317 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.ai · claude-code · side-projects
  2. 2026-01-08Common React Hooks Antipatterns and GotchasLearn about common React Hooks antipatterns and how to avoid them for better code quality.react
  3. 2026-01-08The Simplest CSS GridsLearn the most common CSS Grid layouts with copy-pastable examples for two-column layouts, sidebar navigation, and more.css
  4. 2024-03-13Constants vs Enums in TypeScriptTypeScript tips and trickstypescript

04AI Experiments

Projects, tools, and creative AI workAll projects →

ServiceAI Workflow ConsultingHelping companies implement AI tools and processes effectivelyClaude · LLMs · Prompt EngineeringArticleClaude Code Best PracticesGuide to effective AI-assisted developmentClaude Code · TypeScriptArticleAI GlossaryComprehensive glossary of AI terms and concepts—ExperimentI, AI - Short StoriesScience fiction exploring AI themes and futuresCreative Writing · AI

05Elsewhere

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Programmer's Proverbs600+ ★
YouTube ChannelAI & Dev
Cottage UIReact lib
Work with me

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

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