Building my startup on .Net as well. Been a huge fan for over a decade but haven't written professional C# in over 8 years. It's been a dream to write OSS b2b .

Building my startup on .Net as well. Been a huge fan for over a decade but haven't written professional C# in over 8 years. It's been a dream to write OSS b2b .Net based IT tooling for years now(C# or my language crush F#); and here I am :) Using Asp.Net 7 for the server component with React and Vite as the FE tooling. Been a HUGE learning curve the first couple months particularly around the DI, options pattern, Asp.Net auth and Identity and etc but everything is falling into place now. Also SignalR is much more low-level than it pretends to be lol. It would have been easier to go straight NodeJS as I'm quite proficient in writing even framework level code in it(down to the sockets), but I believe .Net is the better option for this long term.