Hi,
i would like to work for you in your ongoing application.
Please do share some high level requirements. It seems to be a mid or high level complex application As you mentioned some 5+ experienced developers were not able to meet your expectations.
I have 8 years of experience in working with various technologies like php, codeigniter, asp.net, msssql, ,mysql, oracle10g, oracle apps.
I am a full stack developer and can work independently to deliver quality work within timelines.
Thanks.