English - good command

Hi everebody!
I’ve found this line in a vacancy (which I interested in):
"English - good command "
What does it mean in terms of fluency ?

I’ve just checked the LingQ definitions for the levels: I’d say Intermediate 2 or Advanced 1. Doo’s comments in the following thread may help more:

As I recall you have a good command of English Taras. Good luck with your job hunting!

Thanks a lot for the answers and the encouragement. I’ll try to get this position.