It could mean someone who works in a company and does electronics for a living at it, or it could mean (to a lesser extent) someone that is very good with electronics.
'Professional' simply means you get paid for doing it, it doesn't actually give any indication of your degree of competance - although it's often used (incorrectly) in that way.
Like Audioguru, I'm both professional and hobbyiest.
Hi pro Zach,
Sure you're a professional now.
Hobbiests are selfish but you're making something for someone else. Maybe he'll pay you with a case of beer! :lol:
A 'professional' is merely someone who gets paid for doing something, competance doesn't enter into it - although 'professional' is often wrongly used to signify competance. Certainly you see a LOT of very highly paid professionals who are not very good at what they do!.
As you don't qualify as a 'professional', how about 'expert' instead?.