The author of the text is Andrew Robert McBurney, a software engineering intern at Datadog. He contributed to the open source project Homebrew, which is a popular package management system for macOS. To improve the performance of Homebrew, Andrew used Application Performance Monitoring (APM) and instrumented its code using Datadog's ddtrace gem. He identified the bottleneck in the `check_dylibs` function and implemented caching mechanisms using SQLite3 and DBM to speed up the processing of package links. After comparing the performance of the two implementations, Andrew recommended using the DBM implementation due to its faster build time, cleaner code, and ability to fetch data from the cache quickly. The project's requirements were met, with the command processing more than 50 packages in under 5 seconds.