Erik Österlund developed a reproducible Java compiler benchmarking workflow for the openjdk/leyden repository, focusing on performance testing and benchmarking within Java compiler internals. He migrated Javac microbenchmarks from the jmh-jdk-microbenchmarks project, introducing new benchmark classes to measure both single and grouped compilation stages. His work included creating a comprehensive README that details build and execution steps, ensuring the workflow is accessible and maintainable for future contributors. By updating the .gitignore to exclude benchmark outputs, Erik maintained repository cleanliness. The depth of his contribution lies in establishing a robust foundation for ongoing performance evaluation using Java and benchmarking tools.