Hello,
Looks like an interesting project. Could you please describe a bit more details about the project (so I could adjust my bid, if necessary)? Is it going to be a simple Username/Password screen? All the login info is handled (like checking/storing/etc.) by the existing API, right? Do you use Visual Studio for the project?
If I'm not online on Freelancer, please send me a message and I'll answer as soon as I can. My timezone is GMT+2.
Best Regards,
Sergey.