Hi,
I've written a number of iBeacon apps, and I have the hardware available here.
I develop apps for iPhone/iPod Touch/iPad running iOS 9, using Xcode and Swift.
You can see some examples of my work, and client reviews of my completed projects, on my Freelancer profile page.
It looks like you may be new to Freelancer, as you don't seem to have any reputation or project history? Before starting the project, there should be a clear understanding of the details, the deadline, and the milestone payments.
I'd be interested to hear more about the details of your project, including the API and SDK that you mention.
If you'd like to reply to this message, we can discuss things further, before you make your decision on awarding the project.
Best Regards,
- Rob Dixon.