To work at.

At what position? Top management ... apprentice ... facility management?

Apprentice.

In that case I would look for a company that offers apprenticeship with compensation, not just an unpaid internship disguised as "apprenticeship". There are not many that are willing to invest in you in the hope you will be a prospect co-worker and a future asset.

Or at least have some respect for the things they can learn from an apprentice. Also check their actual morals in comparison to their openly and publicly expressed one. I would avoid the ones who openly and purposefully do lie in public. At least they should avoid the gross ones.

As an apprentice you will be on the lowest possible social rank everywhere in a corporate structure. It is cool to know that. There are companies that will make it their habit to let you feel it and there are some that think it will provoke you to fight for attention and put effort in your work ( so that they can benefit ) in order to get a social reward. The best company that you can find is one that likes their apprentice as a valuable asset and person and wants to give and teach you what you need.

Be selective. And do not trust the big international brand names. They are not necessarily bad as such, do not get me wrong. But it takes a bit longer to see who they are since they have a thick established facade to pierce before you get to know them.

;)