Hi there, I am a system engineer for a MNC in Sydney, Australia.
I think I would be a good fit for this project as I am working on a similiar application at my day job.
My approach to this project would be to do some research before deciding on which technology to use. I am not sure if there is an open source SMPP server that you can use, if not I have some other ideas on how this can be supported.
I have developed a similiar application to this before, however the SMSes were not sent through an API, the system was a combination of hardware and software.
IF you have any further information that would be appreciated,
Thanks
Artala