Wish I had the offer! Have dealt with many seed banks in Spain for many years now and could not fault their commitment, communication, willingness to help, quality of products and general enthusiasm for cannabis to become "normalized" in society. Who cares if their English isn't very good, how is your Spanish? Besides, after a while you will get used to it and the different quirks of their language. I would say go for it and grab the opportunity with both hands. I too will take the job if you don't want it!
Hope this helps,.... Organoman.