Antonin Januska · AntJanus
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.
A deployed MVP is worth two prototyped.
Fig. 1. The author.Staff Engineer building AI-backed systems, engineering standards, and the workflows that let teams ship serious software. I have been building software for over twenty yearsTwenty years of building software. More on the About page. and writing about it here since 2012.The site has worn many designs since then; they are archived on the History page.
These days most of what I write is about working alongside coding agents: where they help, where they quietly make things worse, and the small tools I build to keep them honest. Some of it is fiction. Open source work adds up to 600+ GitHub stars,Most of them for Programmer’s Proverbs, a collection that went viral with hundreds of stars and contributions from the community. and the notes below lead to the rest.
Start here
Three pieces that explain most of what this site is about.Why these threeTwo recent essays on building personal software with Claude Code, and the React walkthrough people still send me questions about.
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. View all AI writing →
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.
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.
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.
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…
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. View all writing →
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.
Common React Hooks Antipatterns and Gotchas
Learn about common React Hooks antipatterns and how to avoid them for better code quality.
The Simplest CSS Grids
Learn the most common CSS Grid layouts with copy-pastable examples for two-column layouts, sidebar navigation, and more.
Constants vs Enums in TypeScript
TypeScript tips and tricks
AI Experiments
Projects, tools, and creative AI work.Also on this siteThe UI pattern library: 40 interface patterns, each with the prompt that rebuilds it.
- AI Workflow Consulting Service
- Helping companies implement AI tools and processes effectively. (Claude, LLMs, Prompt Engineering)
- Claude Code Best Practices Article
- Guide to effective AI-assisted development. (Claude Code, TypeScript)
- AI Glossary Article
- Comprehensive glossary of AI terms and concepts.
- I, AI - Short Stories Experiment
- Science fiction exploring AI themes and futures. (Creative Writing, AI)
Elsewhere
Projects worth a look outside this site: Programmer’s Proverbs600+ stars on GitHub., a YouTube channel on AI and development, and Cottage UIA React UI component library built alongside a YouTube tutorial series.. You can also find me on LinkedIn and GitHub.
Work with me. I help companies implement AI workflows and accelerate their development teams.EngagementsAI Workflow Audit (1–2 weeks) · Implementation Sprint (2–6 weeks) · Leadership Advisory (monthly).