A non-profit wants me to build a database for them and I coded everything as a CMS in PHP. But now their IT guy wants it as a Wordpress site and he wants me to send files to the website but I can't update the website or plugins personally myself. How do I go about this?

Shove git in the middle.
You do the work they can sync it, or not.
Otherwise run away, run far far away!

If you cannot update the site directly, it means your testing loops will be longer and thus the project will take longer.

I'd suggest you agree a fee with them for working this way (via the IT-guy).

I would only agree to work this way for systems where I know the tools very well. If you're good with WordPress and are familiar with all the different ways it can fail then go for it. Otherwise this could turn into a forever project.

@C0D4 git-in-the-middle is a good call.

Probably the biggest 180 so far. I've never used Wordpress. I'm waiting for the IT guy's reply

Thank u all :)

Yepp it's gonna be on WP but self hosted.. I'm always learning lol

Wordpress is that cockroach CMS that no matter how much you try to stomp out, people still keep using it. I would even go as far as saying that Wordpress is a huge reason why people hate PHP.

@arekxv it’s a fight between wordpress and Joomla for most of that hate towards PHP

Check https://www.opensourcecms.com
Create a http://____.sudomain and host php filemanager. Every hosting you can create directories and more databases.

Client need to host some files for various researches so found (previous link) the https://www.projectsend.org 1 year active in a subDom