Dev help for leak detection / water shut-off device

Hi SmartThings Community!
I work for a leak detection / water shut-off device. We are in the process of integrating with SmartThings and have run into a few technical questions/blockers during development around permissions, using an MQTTT connection in a SmartApp, capabilities, and device plugins.

Any recommendations on developers, dev studios, or contractors who have experience integrating with SmartThings? We would love to work with them to get this integration across the finish line.

Any help on pointing me in the right direction would be much appreciated!