It's fine that you're using Angular. Be happy if the rewrite succeeds.
If you run npm run start (or whatever script you use) in a NodeJS project, Windows' CMD (or PowerShell), at least on Windows Server, usually blocks/freezes the console after you logout, so you get nothing.
Now, to fix it, the PM2 tool (https://pm2.keymetrics.io/)
is your best buddy. It's very simple to set up and run if you follow their instructions.
I'm not a MongoDB user. I believe you'll need a service to keep it running at all times.