473000 SSH User Account Creation and Expiration script

I intend to use a dedicated linux server to create multiple SSH accounts for many users who will use the SSH accounts for SSH tunneling to bypass very restrictive firewalls/proxy. I need a programmer to code a script or shell script that will allow me to do create the SSH users with the expiration date or duration limit to the SSH server. The script should then automatically deactivate any SSH account that expires based on the set date. Server Specifications: Linux Dedicated Server (Centos OS)