Dear Hiring Manager,
Thank you for giving me the opportunity to apply to your job.
I am an expert on amazon , ebay and other marketplaces.
I have read the job description and I can complete the job within the deadline.
Please check my both profile and portfolio to see previous work experience on desired field.
I have bid for an ongoing period since I want to continue working for you if you are satisfied with my performance.
[Note : I am available to communicate by email or skype]
thanks