Codeigniter Expert Needed to link multiple websites with the same code

Job ID: 33228501

Budget: $250 – $750 AUD

I have a project and a deadline, therefore I need someone who is exceptional and fast but will also bring solutions and thinking into the best method for this project.

I currently have six active advertising sites, all of which were built with the same code and framework: Codeigniter, PHP 8.x, PHP 7.x, MySQL 8.x, and MySQL 5.x.
Each site employs the same client management technology; however, users must currently log into multiple dashboards to manage their advertising / listings and access leads. I need one of the sites to become the Main-Parent-Site, while the other five must function as Child-Sites for the listing owner side.
Notifications must be two-way, with the child sites continuing to receive traffic and those actions being immediately reported to the main parent site, and the child sites being updated when the main parent site is updated.

Please quote your best price and time to complete the job. All sites use this codebase so you can check the documentation and check the demo versions. See image of workflow.

http://preview.codecanyon.net/item/modesy-buy-sell-used-stuff/full_screen_preview/22714108?_ga=2.173917024.2104941027.1647510147-428389693.1610681426&_gac=1.61831646.1644910714.Cj0KCQiAmKiQBhClARIsAKtSj-lB7aD5oibUlgBJjn7JkgcmRih3TnYRyo0HrWEnmgi7opmoxWAeXHcaAn3lEALw_wcB
Related categories: PHP Website Design Codeigniter MySQL HTML