Andrew Vaslas modernized policy management in the facebook/fbthrift repository by migrating XSU policy definitions to the PZSchema format. This backend development effort involved updating configuration files and introducing automated code generation, which replaced legacy manual policy code and reduced technical debt. By consolidating policy definitions under a single schema, Andrew improved compatibility with downstream policy engines and streamlined future policy evolution. The migration leveraged his skills in schema migration and policy management using Hack, resulting in a more maintainable and reliable deployment process. His work minimized surface-area impact through careful tooling updates, aligning policy handling with dependent services’ requirements.