During November 2025, Darin Costello focused on improving build reliability in the conan-io/conan-center-index repository by addressing dependency management challenges in C++ projects. He stabilized the protobuf build process by ensuring protoc executed reliably when protobuf was built with shared libraries, introducing protobuf as a build requirement to resolve toolchain inconsistencies. Additionally, Darin refined the libarrow_substrait package to conditionally include dataset modules, which reduced unnecessary dependencies and improved build performance for downstream users. His work leveraged expertise in C++ build systems, package management, and Python scripting, demonstrating a thoughtful approach to resolving nuanced build and dependency issues in complex environments.