1. Server side in Go 2. Cross-compiling it 3. sftp'ing and restarting the service everytime 4. postgres 5. ansible 6. Makefiles 7. Webpack 8. Babel 9. React
Cross-compiling with Go is done by setting two environment variables. That's it. This is not like the mess of C++ cross-compiling. In LiteIDE it is simply a matter of choosing Linux from a drop-down: https://www.wut.de/pics/screenshot/e-505ww-07-pide-000.png
SFTP is not exactly hard. Nor is `nohup ./server &`.
From 5 on I agree though - is that 4 build systems? Insanity. I would just make a static web page with normal HTML forms or whatever and Go templates. If you really need client-side Javascript, I'd just use jQuery, or something similar and lightweight like minifiedjs.