Dear Sir
I'd really like to work with you on this one if possible!
My name is John and I am a C, C#, Java developer with nearly 10 years of experience, so I am pretty familiar with what you need doing.
If you take a look at my work and feel that I could help you, I'll do it for a 10% discount.
If the above offer sounds like something you would be interested in, I'd love to hear from you.
Regards.
John