Dear Sir,
Today I have found this job post on freelancer, and I'm interested in your job post. I have good experience on your job. I can dedicate 40 hours/week for your job, and my daily hours are negotiable. I'm very excited to offer my services for your job. Please feel free to contact me directly to discuss this position further.
We can discuss there in detail in a quick way, if you are interested.
Regards,
Atik