Full build is documented in the video below.
This project uses an Arduino Nano. Only required 2 inputs and 2 outputs so it could have been basically any microcontroller you wanted.
I used a inexpensive smart garage door controller to handle all the smart phone and Alexa integration. All I had to to was make it think the chicken coop door was a garage door.
A lot of people since the pandemic have started a chicken coop at home. I'm sure there are a bunch of those people that do not want to open the coop door at 6am every day and remember to close it every night. This can help, and will allow you to even open or close it anywhere you are and check the status on it.
Lastly, this app also allows you to set us a schedule. I'm not sure the purpose of this is for a garage door but it works well for chicken coops.