Eduardo Lemos developed a CPU-bound matrix multiplication microbenchmark for the nanvix/nanvix repository, focusing on expanding the project's benchmarking capabilities. He implemented the microbenchmark in Rust using a cache-oblivious algorithm to better reflect realistic performance characteristics. The benchmark supports configurable parameters through environment variables, allowing flexible performance testing across different scenarios. Eduardo integrated the new benchmark into the existing build system by updating both Cargo.toml and Makefile configurations, ensuring reproducibility and ease of use. His work enables baseline performance measurement and regression tracking for matrix-multiplication workloads, demonstrating depth in benchmarking, systems programming, and build system integration using Rust and Makefile.