Thanks! Yeah, it was definitely an ambitious choice, but I think it results in a better product, and I'm really happy with how it's turning out. For now it's just me part time, but I'm hoping to go full time or near full time next year.

In terms of stack, there's an open source core written in Go which exposes an HTTP API. The UIs then use that API. There's a cut down web frontend written in VueJS (useful for forward deployments), a GTK frontend for Linux written in Vala, and the MacOS version is using Swift/SwiftUI (with some use of AppKit where that's not applicable).

Then (because this isn't ambitious enough) once those are polished, I plan on doing a native Windows frontend too (likely using C# with WinUI 3, but to be confirmed).