I am a retired mechanical engineer (native English speaker) who has worked in sales and marketing in international markets during 30 years of my active working life.
My main client currently requires me to handle enquiries, e-mails, phone calls etc with his UK and Scandinavian customers, and our arrangement works very well. If you wish, I can get a reference from him.
Unclear areas are clarified promptly and clearly using e-mail and skype. Since I am retired, my hours and days of work are very flexible. This makes it possible to work across most global time zones.
I would be interested to hear more about the nature of your project, and what nature of subjects/product I will need to deal with. Please contact me to see if we can find common ground.
Best regards,
Doug Lumley