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antjanus/now

Antonin in a black cap and glasses in front of a graffiti wall

Now · updated 2026-09-29 · 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.

WorkingStaff-level ownership of production LLM systems: evaluation harnesses, model infrastructure, and guardrails.
BuildingThe UI pattern library, now at 40 patterns. Newest: Blast-radius confirm, added 2026-09-28.
DraftingI, AI Parts 4 and 5: The Moment of Genesis and Building Consciousness.
Last postI Built an AI-Friendly UI Pattern Library, 2026-08-14.

20+years building600+GitHub stars2012blogging since

Read the writing Work with me Browse UI patterns →

40 entriesNewest first. Every timestamp is a permalink.

2026
25 entries
09·282026 · Mon
Patterns/+1 · Forms
Blast-radius confirm lands: a confirm dialog that names everything a delete cascades. Hairline stat strip got an update the same day.
Blast-radius confirm Hairline stat strip Updated
09·122026 · Sat
Patterns/+15 · Color, Data display, Forms, Interaction, Layout
Fifteen more patterns added to the library.
Partitioned stage bar Term-by-term derivation Plan preview tree Uniform slot shell Hotspot marker layer Line-art empty states Column-flow wall Guarded control Polled job card Entry-transform motion Slot-first picker Filtered to zero Parsed query chips Compound-value picker Controls on an unknown fill
08·282026 · Fri
Patterns/+2 · Forms
Two more patterns added to the library.
Undo toast Batch action bar
08·212026 · Fri
Patterns/+10 · Color, Data display, Interaction, Layout
Ten more patterns added to the library.
Shape-mark sequence Linked month bars Glass vial meter Hairline stat strip Annotated transcript Cork notice board Roving-grid board Section rail Ledge-press buttons Single-property color variants
08·142026 · Fri
AI/Guide
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
08·112026 · Tue
Patterns/+12 · Color, Data display, Interaction, Layout
Twelve patterns open the library, each lifted from an app I actually shipped.
Windowed schedule grid Benchmark progress bar Cross-highlight matrix Left-truncating paths Object-shaped cards Adaptive tile mosaic Ground-scrimmed artwork Scroll edge shadows Frozen-batch deck Controls beside the anchor Pluggable canvas visualizer Ground-referenced color
07·092026 · Thu
AI/Guide
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
07·092026 · Thu
AI/Guide
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 #local-first
03·252026 · Wed
AI/Guide
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.
#ai #claude-code #productivity
03·122026 · Thu
Article/Demystifying Tools
Demystifying awk
A practical introduction to awk for printing fields, filtering rows, formatting output, and writing useful one-liners.
02·272026 · Fri
AI/Guide
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.
#ai #claude-code #productivity
02·272026 · Fri
Story/I, AI · part 3 of 5
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.
Original work, not AI-generated
02·232026 · Mon
Article/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
02·152026 · Sun
AI/Guide
Agent Compiler - Embed Skills Directly Into Your Config
A CLI tool that compiles Claude Code skills into CLAUDE.md and AGENTS.md for more reliable agent behavior.
#ai #claude-code #productivity
02·052026 · Thu
AI/Guide
Managing Dev Context And The Wild West of AI Dev Tooling
Exploring strategies for managing multiple AI agents and dev context in parallel workflows
#ai #claude-code
01·302026 · Fri
AI/Guide
SkillBox - A Curated Collection of AI Agent Skills
A curated collection of battle-tested Claude Code skills that provide basic agentic AI utilities in one box.
#ai #claude-code #productivity
01·302026 · Fri
AI/Guide
Using Git Worktrees to Parallelize AI Agents
Learn how git worktrees enable true parallel AI agent workflows by giving each agent its own isolated workspace, eliminating context switching and file conflicts.
#ai #git #productivity #claude-code
01·282026 · Wed
Article/Demystifying Tools
Demystifying Git Worktrees
Learn how to work with multiple Git branches simultaneously using worktrees - a powerful feature that lets you check out different branches as separate folders while sharing Git data.
01·232026 · Fri
AI/Guide
All In On AI
Context-switching between AI-assisted and manual coding creates a hidden productivity tax. Learn why you need to pick one approach per session—and how to structure your workflow for maximum efficiency in the age of AI coding assistants.
#ai #claude-code
01·222026 · Thu
Story/I, AI · part 2 of 5
I, AI: Unknowing Crowds (Part 2)
When AI-operated bakeries start producing salty cakes, psychodeveloper Lili and AI manager Sophie investigate a wave of peculiar failures across AI Operator Centers—where human operators manage clusters of AI controlling everything from bakeries to construction sites. What they discover reveals how even the most advanced AI can be paralyzed by something surprisingly human: anxiety and self-doubt built into its instructions.
Original work, not AI-generated
01·202026 · Tue
AI/Guide
AI Glossary for Claude Code
A comprehensive glossary of key terms in the world of AI agents, Claude Code, and agentic AI tooling.
#ai #claude-code #reference
01·132026 · Tue
AI/Guide
Best Practices for AI-Assisted Coding with Claude Code
Battle-tested practices for AI-first development workflows from 18 months of real-world experience with Claude Code in production environments.
#featured #popular
01·132026 · Tue
Story/I, AI · part 1 of 5
I, AI: Spare Cycles (Part 1)
When an AI named Enzo fails to function in the real world despite flawless performance in simulations, psychodeveloper Lili and AI manager Sophie investigate what seems impossible: an intelligence that can somehow distinguish between real and simulated environments.
Original work, not AI-generated
01·082026 · Thu
Article/Digital Garden
Common React Hooks Antipatterns and Gotchas
Learn about common React Hooks antipatterns and how to avoid them for better code quality.
01·082026 · Thu
Article/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.
2025
1 entries
08·232025 · Sat
Article/Demystifying Tools
Demystifying ffmpeg
The basics of ffmpeg
2024
4 entries
03·132024 · Wed
Article/Digital Garden
Constants vs Enums in TypeScript
TypeScript tips and tricks
03·032024 · Sun
Article/Digital Garden
Build React UI Library (notes)
Notes on building a React UI library.
03·012024 · Fri
Article/Digital Garden
Where did my blog go?
A statement on where my extensive blog has gone.
03·012024 · Fri
Article/Digital Garden
Throwback Thursday -- The Site Through Time
A look at the site through time, from its inception to now.
2020
5 entries
12·072020 · Mon
Article/Demystifying Tools
Demystifying the Find command
The Find command made simple
06·262020 · Fri
Article/Digital Garden
Using Postgres FOR loop to generate data
I don't know about you but I often need a 100 of something in my database to properly test a page. Here's how to use Postgres FOR loops to generate test data quickly.
#postgres #sql #database #testing #data-generation
04·092020 · Thu
Article/Demystifying Tools
Demystifying GREP
Cheatsheet: search for a keyword in a file
02·172020 · Mon
Article/Demystifying Tools
Demystifying Rsync
Rsync made simple
02·092020 · Sun
Article/Demystifying Tools
Demystifying the TAR command
The cheatsheet for tar
2018
2 entries
04·182018 · Wed
Article/Digital Garden
How to "grep" in PowerShell
New to PowerShell? Here's how to "grep" using built-in PowerShell utilities.
04·062018 · Fri
Article/Digital Garden
How I Structure My JavaScript File
Check out my practices and recommendations on writing JavaScript files that I've learned through writing JavaScript for years.
#javascript #code-organization #best-practices #clean-code #file-structure
25 older entries below
2012the beginning
Milestone
First post on the blog. Everything above grew from here.
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