Tim Bess focused on reliability engineering across build systems, addressing subtle but impactful bugs in both the ziglang/zig and bazelbuild/rules_rust repositories. He improved the Zig build pipeline by refining dependency promotion logic, ensuring lazy dependencies were correctly promoted to eager, which stabilized builds and reduced intermittent CI failures. In the Rust workspace for Bazel, Tim resolved cross-platform digest inconsistencies by normalizing Cargo configuration parsing, introducing a deserialization step and regression tests to guarantee consistent digests between Windows and Linux. His work leveraged Rust, Zig, and build system development skills, emphasizing robust testing and cross-platform stability over new feature delivery.