Steve Kollmansberger, a renaissance man with interests in software development and aviation, built a Twilio-powered IVR system for his flying club's phone reservation system using Haskell. The system allows users to call a number, enter their member ID, start date, end date, and aircraft number, and confirms the reservation if it is available. The code utilizes Twilio's IVR capabilities and Haskell's concurrency features to create an efficient and user-friendly experience.