I have an extensive experience with .Net . and I have done a lot of API projects using .Net / asp.net / C#. I have a slight experience of using a telephone API with C#, not sure if that will count in this situation.
As you said, we'll need a session to discuss the changes you need and I need to look into the existing code as well , to better understand what you have mentioned in the changes list. After reviewing all work, I can confirm that if I'll be able to deliver on 8 Nov or not.
Following are just a few projects I've done in the recent past.
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Primary Technologies used (in all projects):
ASP.Net , C#, Sql Server , Entity Framework, jQuery , AJAX , webservices, API integrations, XML, JSON
If you look closely to my profile and particularly software projects, you'll find around 65 projects, all 5 star rated and with outstanding client reviews. I pick limited work to maintain my quality level. The product I deliver is usually not comparable because of the appearance, quality and performance. I would be happy to show you more of my work on demand.
Let me know if you like my profile, so we can get this thing kicked off whenever you need.
Thanks
Adeel