Hello ..
Just read over your project application, my name is Shelingholmes, i am Wordpress developer, 4 years experience in WP especially when it come to tweaking, api and plugin development ..
Based what i've get from your explanation on project board, website A will fetch a post from feed that available in B every 10 minutes, i could make this process without creating custom cron job since Wordpress has their own cron task ..
and to fetch an item from feed, we can use php simple xml parser to fetch the item from feed, and insert/filter them to appropriate categories in Wordpres. I will do this with by creating custom plugin, without bothering wordpress core itself ...
I can guarantee the plugins is ready for use, and working properly. My plugin will be written based at standar php coding for Wordpress as on their documentation, it's expected to get result more cleaner, free from bug, and avoiding overriden by other files ..
Please let me know if you're interested, if possible, i would like to discuss further details and ensure we're on same page :)
Thank you ^_^, and
Regards,
Shelingholmes