Create Signed macOS .pkg Installer

I have a finished macOS desktop application and now need a properly signed, production-ready .pkg installer. Because I do not have access to an Apple Developer account, I’m looking for someone who can build the package under their account and return a file that I can distribute immediately.

Here is what I need you to do for me:

• Build a .pkg that installs the app into a custom path I’ll specify once we start (not the default /Applications).
• Run a short pre-installation script (to check for previous versions) and a post-installation script (to write a small config file).
• Sign the installer with a valid Developer ID certificate so that Gatekeeper opens it without warnings.
• Send back the final .pkg plus the commands or Xcode project settings you used, so I can reproduce the build later if needed.

The .app bundle, icons, and both shell scripts are ready to hand over as soon as you accept the job. If you can also notarize the installer, let me know—that would be a bonus but is not mandatory.

Turnaround is flexible for a day or two, but I’d like to wrap this up quickly.