automation – Is it possible to automate a complex task without using apps or rooting? If not, which is recommended?

So, we are part of a company that provides VPN services to retailers. One of our clients doesn’t want to have their employees open up the VPN and login every time they turn the device (an Android tablet) on. This involves opening up OpenVPN, putting in credentials and clicking the Connect button. Is this possible natively, without rooting – opening up an app and putting in credentials automatically – or do I absolutely need an external app? If so, which app is the most recommended in this case?