Dear Sir,
I have read your Project Description & seen the attached diagram, which clearly explains the overall Application flow but we really need detailed specs or high level features to give you our precise estimate.
So, please drop me a message thru' Freelancer PMB, so we can discuss the requirements & come up with our estimate in terms of time & cost to move forward. As you know that without having detailed requirements, we cannot estimate it, so please ignore our current bid, as it is just a placeholder.
Look forward to hearing from you.
Regards,
YK
LEADconcept