Worked on build performance optimization for the openai/openai-node repository, focusing on reducing esbuild bundle size and improving startup times. Refactored Zod imports by switching from alias imports to explicit named imports from zod/v3 and zod/v4, which reduced the bundle size by approximately 260KB. This change enhanced build efficiency, improved tree-shaking, and resulted in smaller artifacts for end users. Demonstrated strong attention to dependency hygiene and traceability by referencing specific commits. The work was implemented using TypeScript and esbuild, with a focus on optimizing build processes rather than addressing bug fixes during the reported period.