Dear Friend
I am writing to enquire if I can work with you on this project, it looks exciting and I think I can do it very well; I am currently working in HUAWEI technologies in Customer Support department for mobile networks (GSM, UMTS, LTE) dealing with management, engineering and technical challenges.
I am a conscientious person who works hard and pays attention to detail. I'm flexible, quick to pick up new skills and eager to learn from others. I also have lots of ideas and enthusiasm. I'm keen to work for you as a freelancer.
I have excellent references and would be delighted to discuss any possible vacancy with you at your convenience.
Yours sincerely