Kindly note that for now, we have given you our ballpark estimate, just to give you an idea, as trip advisor is huge website, having loads of features, so we really need to finalize the scope of work.
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Dear Sir,
I have read your Project Description and can you please provide me more detailed requirements or at least list of features? As you know that cost of any Application depends on the overall features/tasks & scope of work, so can you please spare some time & write high level list of features/tasks in a word document, just bullet points high level points for us to estimate it precisely. You don't have to write big paragraph but just high level bullet points features are fine, as all our developers team are experienced, so we can easily understand the scope of work.
Please let me know, if you want to review some of our past work as I don't want to bombard you with lot of links at first place.
Look forward to hearing from you and talking to you further thru' Freelancer message board.
Regards,
YK
LEADconcept