Over a two-month period, Ivan focused on stabilizing and maintaining core infrastructure in the facebook/fbthrift and facebook/buck2-prelude repositories. He addressed critical build and test reliability issues by reverting dependency changes that introduced instability, such as restoring protocol test includes in C++ and Protocol Buffers after a problematic serialization update. In buck2-prelude, Ivan reverted a dependency bump to maintain BUCK build compatibility, ensuring consistent CI and local development workflows. His work emphasized disciplined version control, careful rollback procedures, and thorough validation of test suites, demonstrating a methodical approach to infrastructure maintenance and build system configuration using BUCK and C++.