The author is creating an SMS notification service using Serverless and Twilio to alert users of low gas prices on the Ethereum blockchain. The application uses a free tier account with AWS Lambda, and triggers the function at intervals to check for low gas prices. Once the price drops below a certain level, an SMS is sent to a recipient number. The author also discusses how the Serverless framework abstracts the AWS interface away from developers, making it easier to create serverless applications. Additionally, the tutorial shows how to connect the function to Twilio and send an SMS using the Twilio helper library. Finally, the application is scheduled to run at regular intervals to check for low gas prices.