About

I'm Hans Sep, a product manager at Fiery (print automation software) with a deep technical background across full-stack development, desktop apps, and workflow systems. my.daybuilds.ai is where I document quick builds with AI coding assistants—not just the code, but the implementation plans that make them work.

My product philosophy: solve real problems, make it beautiful, make it fast, and lead. Every project here reflects that—whether it's an ESP32 presence sensor, a JobFlow Pro extension, or this very site.

What I Build

My focus areas span hardware (ESP32 sensors, IoT devices), software (Electron apps, JobFlow Pro extensions, MCP servers), and web (TypeScript backends, Astro sites). I care about the intersection of AI-assisted development and product quality—building things that are both functional and polished.

Why Share Plans?

With AI coding assistants, your users don't need your app anymore—they can build it themselves. But they do need good plans. Each project here includes the actual implementation plan I gave Claude, structured so you can copy it and adapt it for your own builds.

The Daybuilds Philosophy

Build time starts when it works for real. When I say a project took one day, I mean the time from first commit to "it's actually working." Continuous improvement code trickles after that don't count—the timer stops when the core functionality is live.

Good enough beats bulletproof. These projects aren't production-hardened enterprise systems, and that's intentional. I use code review skills and security evaluations to meet acceptable criteria—the code works, it's reasonably safe, and it solves the problem. Perfect is the enemy of shipped.

Learn principles, not syntax. One major realization: even when I don't understand the code (like Swift for the Lock app), I learn about principles—RSSI signal processing, thread management, Matter over WiFi, Kalman filtering. That's the real value. You learn concepts without getting stuck implementing them, which opens up entire domains that would otherwise require months of language study.

Claude Code Skills We Use Most

These builds rely heavily on Claude Code's specialized capabilities. Here are the skills and workflows that show up in nearly every project:

  • /commit - Automated git commit messages with context-aware descriptions
  • Plan mode - Structured implementation planning before writing code
  • Code review workflows - Built-in quality checks and security evaluations
  • Platform-specific agents - ESP32/PlatformIO for hardware, Swift/Xcode for macOS, Astro for web
  • Security scanning - Dependency audits and vulnerability checks (Trivy, SBOM generation)
  • Multi-language context - Seamlessly switching between C++, Swift, TypeScript, Python within projects

The Duration Subdomains

Connect

Find me on LinkedIn where I write about AI, product management, and print technology. Or send me a message directly.