Hello!
I’m developing a new project with arduino + Blynk and I was thinking that this project would be fantastic with voice commands (through a background service that recognizes presetted commands) and NFC tags.
I think there is a post on using Alexa with Blynk somewhere on the forum, so that could be something to look into. Or if you want something cheaper you could look at Jasper as backend running on a Pi for voice control.
NFC is probably something you can al ready do. I have an NFC reader for the arduino, use your phone as tag to open doors 
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