Twilio’s Serverless infrastructure is used for the application, eliminating the need for hosting. The application handles time zone management and call routing based on day and time of day relative to business hours and the server's location in a different time zone. A Node.js project is created using the Twilio Serverless Toolkit, which provides CLI tooling for developing locally and deploying to Twilio Runtime. The application includes a Function that uses built-in methods courtesy of Intl to format dates and handle call routing, making it more portable and flexible. Environment variables are used to store sensitive information such as phone numbers, allowing for easy configuration changes without redeployment.