Worked on stabilizing frontend build instrumentation and improving bundle visibility for the toss/frontend-fundamentals repository by fixing the Bundle Analyzer integration in Vite. This involved moving the rollup-plugin-visualizer configuration to the correct location within Vite’s build options, ensuring Rollup processed the plugin and provided accurate bundle insights for performance optimization. Later, contributed to TanStack/query by enhancing code clarity and maintainability, specifically cleaning up a duplicated word in a core comment to support future contributor onboarding. Demonstrated skills in JavaScript, TypeScript, and build tooling, with a focus on configuration, documentation, and precise, traceable commit practices across both projects.