Hi Concern,
We are group of people who works on Appian and we have extensive experience in Appian development.
We are expert in Appian objects SAIL, Process Model, CDT, Expression Rules, Integration, Query Entity etc.
We can work on your poc. If we can schedule one meeting then it will be helpful for us to understand the requirements and also helpful to estimate budget and time frame.
Kindly let me know if you need any further information.
Regards
Abhay
Skype :Abhay.w