If you want to create a new FTP user for your developer then you can do this using in your hosting panel.
Login to hosting panel using your “yourwebuser“:
https://your_server_ip:8083
web > yourdomain.com > edit
Check “Additional FTP”
Provide the FTP user credentials and path.
Example path:
/home/yourwebuser/web/yourdomain.com/public_html/
/home/yourwebuser/web/yourdomain.com/public_html/subfolder