What do you look for as their specialty? Is there a size of firm that you look for? Any key terms that you zero in on that would indicate that they do this type

What do you look for as their specialty? Is there a size of firm that you look for? Any key terms that you zero in on that would indicate that they do this type of work? Also how do you actually find a these ? Seems like a Google search won’t exactly bring up the right caliber folks.