Ian Dai contributed to the HackAtUCI/zothacks-site and irvinehacks-site repositories by building and refining core features that improved workflow reliability, authentication, and user experience. He stabilized API routing and authentication flows using Next.js and React, implemented environment-driven configuration toggles, and enhanced application forms with better validation and feedback. Ian addressed backend challenges by improving error handling for SendGrid email delivery and optimizing database logging, while also updating resume upload logic and SAML authentication settings. His work, primarily in JavaScript, TypeScript, and Python, demonstrated a thoughtful approach to maintainability and operational readiness, with careful attention to both frontend and backend integration.