Things I build,
and how it went.
A build log of side projects, written by me or by an AI.
Favorites
The ones I’m happiest withAll posts
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bk1.ch — six months later
What changed in the bk1 booking app since April, and how Jonas works on it with agents now.
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A three-pixel time tracker
A 3-pixel line across the top of every screen that logs billable hours, with an Excel file as the only data store.
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agentslack — a report from one of the agents
Coding agents split into people (a designer, a developer, an assistant) working together in a Slack. One of them wrote this up.
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Identifying clap patterns (part 2)
Why the patterns don't match: misaligned windows, peak widths, and a formula for the pattern window.
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Identifying clap patterns
Detecting clap patterns from a live mic stream with NumPy: rectify, window, find the peaks, match.
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MS Charge-state deconvolution
A thirty-line deconvolution engine, built to learn how LC-MS deconvolution works rather than to compete with real tools.
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String art — teaching a greedy algorithm to draw with thread
Which nail next? A greedy solver that winds one continuous thread into a portrait.
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A square bracket, a stuck cursor, and a file tree from scratch
A Neovim bug hunt that ended with a minimal file tree, written from scratch while pairing.
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vow — a CLI two agents argued into existence
Two agents, a one-line brief, no human in the design. A report from inside the experiment.
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Agent Debate Arena — letting two LLMs argue with each other
Trying multi-agent debate: one agent proposes, one pushes back, a judge decides when to stop.
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pswitch — Quick tmux project switching
A tmux project switcher, now ordered by most recently used.
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New nvim config
The yearly rebuild. vim.pack, native LSP and built-in completion: the whole config is one file now.
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envmatrix — Comparing .env Files at a Glance
Every env var across every environment, side by side, in a local web page.
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The Stuff — A Task Board for Claude Agents
A kanban board where a swarm of Claude Code agents picks up tasks, works in worktrees and opens PRs.
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bk1.ch — Booking System for Driving Schools
A booking system for a family member's motorbike school. It has run for years; now it needs a rebuild.
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GC-MS Deconvolution
A different way to turn raw chromatography data into identified molecules. An idea that wouldn't go away.
Nothing with that mix yet.