At that time, gnome-tweak-tool was the go-to-tool however, since a few days, that app. is not there anymore.
I am running on Debian buster.
I even tried out a version from snapshot but it didn't do anything for couple of apps. which I wanted to be there right from boot.
I tried bum only to see and understand that it's a run-level editor, useful but not for the scenario I have in mind which is simply asking the system to start some services after logging on to the desktop. Even systemd-ui which was a separate package in no longer there.
So how can we do the same in mate ?