Diorama 1 · Home
The site, as a small city
Antonin Januska · Staff Engineer · Boulder, CO
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.
Diorama 2 · Writing
The three collections, as a bookcase
Writing
Writing, since 2012
18 articles on engineering, tooling, and the craft of building software.
Diorama 3 · About
A staircase of things I make
About
Hi, I'm Antonin.
Staff Engineer building AI-backed systems, engineering standards, and the workflows that let teams ship serious software.
Staff engineer focused on the infrastructure production LLM systems run on: evaluation harnesses, multi-provider dispatch, rate-limit handling, and guardrails on model output.
Start here
Three pieces worth your first ten minutes
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.
The Anatomy Of My Ideal React Component
A walkthrough of my very opinionated React Component.
AI & Machine Learning
Workflows, tools, and experiments
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.
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.
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.
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, Lili and Sophie are sent off-world.
Digital Garden
Engineering, opinions, deep dives
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
AI Workflow Consulting
Helping companies implement AI tools and processes effectively
ServiceClaudeLLMsPrompt EngineeringClaude Code Best Practices
Guide to effective AI-assisted development
ArticleClaude CodeTypeScriptAI Glossary
Comprehensive glossary of AI terms and concepts
ArticleI, AI - Short Stories
Science fiction exploring AI themes and futures
ExperimentCreative WritingAIWork with me
Bring AI into how your team actually ships.
I help companies implement AI workflows and accelerate their development teams.
Get in touch →