Gitsanity 2.0: The Linux Kernel in 51 Seconds, From a Terminal
I rewrote my Git analytics Mac app as a Rust terminal app in one evening with Claude Code. No database, the whole Linux kernel indexed in 51 seconds, and dates that are finally right.
Daniel Wanja · Nouvelles Solutions, Inc
Enterprise Architect
& Lead Developer.
Four decades of turning complex ideas into software that actually ships. I help organisations of all sizes build scalable, robust products — cloud-native web apps in React, TypeScript and Ruby on Rails, and native macOS tools in Swift.
40+ years building software. Google Cloud and Convex.dev architect and developer. 200+ articles written.
Daniel Wanja · Enterprise Architect & Lead DeveloperWhat I do
About Daniel →01
Frontend architecture
React, TypeScript, Next.js and Tailwind, organised as Nx monorepos that teams can actually maintain.
02
Native Apple platforms
Swift and SwiftUI for macOS and iPad — from prototype to notarised, shipped app.
03
Backend & cloud
Ruby on Rails, Convex.dev and serverless — and cloud architecture on Google Cloud, from data model to deployment.
The books
Two free books on building software with Claude: the principles for whoever decides what gets built, and the playbook for whoever builds it. CC BY 4.0, sources on GitHub.
Book · v1.2 · 74 pages
Architecting with Claude
The PrinciplesTwelve principles for designing AI systems that work, for whoever decides what gets built. With a one-page cheat sheet, slides and a best-practices guide.
Book · v2.0 · 105 pages
Coding with Claude
A Developer's PlaybookHow to steer Claude Code on real software, with playbooks for feature slices, APIs, legacy migration, whole-app runs and team rollout. With a checklist for your own repo and a two-page cheat sheet.
The lab
Each of these apps is an experiment — a deliberate exercise to find the limits of a different AI coding tool (Codex, Claude, Cursor, Bolt) and write up what I learned.
All 16 →
AccentPreview · iPhoneRead aloud, revisit a sound, and practice with an on-device coach.
Spaceship DashboardmacOS · Apple TVReal Mac telemetry on a cinematic console, with a native Apple TV receiver.
Gitsanityv1.0 · macOSCommand line ↗Turn any Git repository into contributor analytics, hotspots and trends.
SendToAIv1.0 · macOS · iPhoneOne tap, any engine: Apple Intelligence, ChatGPT, Gemini or Claude.
Folder Analyzerv1.2 · macOSMillions of files scanned in seconds, shown as an interactive treemap.
DocIQv1.0 · macOSStructured data out of PDFs, across fifteen industries.
DMG Makerv1.1 · macOSDisk images worth opening, with AI-generated backgrounds.
AI RenameRetired · macOSRetired. On-device AI gave your PDFs the filenames they should have had.
MermaidViewerv1.10 · macOSMermaid.js layouts with native Mac drawing, themes, Quick Look, and CLI support.