Worked on cross-repository improvements to build systems, focusing on Bazel and Rust for backend development. In the bazelbuild/rules_rust repository, addressed non-deterministic OUT_DIR contents to stabilize TreeArtifact hashes, reducing rustc cache misses and improving build determinism. In TraceMachina/nativelink, introduced a backward-compatible option to the GrpcSpec struct, enabling use of legacy ByteStream resource names for older backends and preventing InvalidArgument errors. Expanded test coverage ensured regression safety and validated interoperability. These changes enhanced CI stability and developer throughput by reducing cache churn and supporting a broader range of backend systems, leveraging expertise in Bazel, Rust, and gRPC.