Hi,
I am a currently working for ESRI in the SDK department and has over 5 years of experience of working with ESRI products including desktop,server and Runtime SDK's and API's.
I have made some useful apps previously using ESRI geotrigger SDK. It would be great if you can provide a detailed description on the workflow of your app. This will be great in deciding the cost and time frame accurately.
Looking forward to work with you.
Regards,
Nikhil