Worked on two open source repositories, focusing on both feature development and code quality improvements. In Automattic/harper, addressed a persistent linting issue by refining rule definitions to correctly recognize 'built-in' as a compound adjective, reducing false positives and streamlining code review processes. For puppeteer/puppeteer, developed and released the Page.emulateLocale API, enabling developers to simulate different locales for web page rendering and interaction. This addition included updates to documentation and comprehensive end-to-end tests, enhancing localization testing coverage. Utilized TypeScript and expertise in API development, linting, and text processing to deliver targeted, maintainable solutions that improved developer workflows.