Maj Fil worked on release management and CLI enhancements across slackapi/bolt-js and sanity-io/sanity. In bolt-js, Maj focused on stabilizing middleware and token handling by reverting an experimental auto-acknowledgement flag, cleaning up type definitions, and ensuring backward compatibility through careful release automation and packaging improvements using JavaScript and TypeScript. In the sanity repository, Maj expanded the CLI to support new blueprint function types for document changes, adding filters for drafts and all versions, and updating help text and function signatures. The work demonstrated a methodical approach to refactoring, testing, and release management, delivering targeted improvements with clear business value.