Autoposting service for specific bulletin boards

You need to make a site with your engine (site frame, admin, news, articles, the main part of which will be in the TZ, user registration). The engine must be designed for SEO, i.e. Meta tags, site map, etc.
The very essence of the site - the user registers, makes his ad in our form, selects sites for posting, then the site automatically sends ads to the selected sites. IPA sites do not provide, so you need to make a separate module for each site. After posting, the ad is tracked, i.e. It can be changed or removed (if the board allows). These sites will be from 30-50. They will be rebuilt and will need to be rebuilt.