Mateusz Gajda focused on build tooling and release process maintenance for the shelfio/eslint-config repository during March 2025. He stabilized the Babel runtime dependency by updating yarn.lock, ensuring more reliable and reproducible builds. His work included preparing and tagging the v5.0.2 release, which streamlined the release workflow and improved CI consistency. Mateusz applied his expertise in dependency management and YAML to harden the build pipeline, addressing potential sources of build failures. Although the scope was limited to a single feature and no bugs were fixed, his targeted improvements contributed to faster iteration cycles and enhanced the overall stability of the project.