Redjard

Installing an apk, installing directly, …
As opposed to installing from Fdroid, from gplay, …

You can also go by source, like with the stores. For example Signal android can be installed from their website (by downloading an apk).

Not sure how far you wanna go. I know my way around mediawiki from the sysasmin side (installing, updating, installing extensions and themes, configuring weird features like ldap auth, …), the admin side (css, users and groups, templates and lua scripts), and some moderation (editing etiquette on wikipedia and a few other wikis, typical style guides, organization of pages and overview pages).

I’m quite busy lately, but you could ask me some questions via dm for example and I would be willing to do some small things.