The author of the article, Kyle Kelly-Yahner, shares how Yext built a simple user verification system using Twilio Voice API and Java Play framework within one week. The system allows customers to receive a phone call with a verification code, which they must enter to complete the verification process. To build this system, Yext used the Twilio API to make outbound calls and gather user inputs, and the Play framework to process requests from the Twilio API and send back TwiML responses. The system uses a database to track call history and updates it after each call.