This tutorial series aims to build an automated wake-up call service using Twilio Programmable Voice. The first part of the tutorial focuses on creating and triggering alarms through a Cron job and Twilio Programmable Voice. The completed source code for this part is available in a Github repository. The service will create a scheduled cron job that triggers at specified times, simulates an alarm ring by making outgoing phone calls to users, and allows users to snooze the alarm by ignoring or declining the call. The service also handles time zones and limits the number of attempts a user can receive a call to prevent abuse. The tutorial covers topics such as alarm trigger, call cycle, snooze button, and stopping the alarm. It provides a comprehensive overview of how to build an automated wake-up call service using Twilio Programmable Voice.