Matt Shaer worked on the facebook/fbthrift repository, focusing on stability and privacy improvements for the XSU Consent Service. He introduced a Thrift service name constant in the IThriftClient interface using PHP, which prevents infinite recursion during consent checks and aligns the opt-out logic with the PZ service. By adopting the same Thrift opt-out list as PZ, Matt ensured consistency and reduced unnecessary evaluations in the consent flow. His work in backend development and API design enhanced the reliability and maintainability of the XSU implementation, addressing privacy commitments and improving traceability across services within the fbthrift codebase.