Alec Song contributed to the ucsb-cs156-f24/proj-happycows-f24-09 and team02-f24-09 repositories by building user-facing navigation improvements, establishing a robust data layer, and enhancing UI/UX elements. He implemented database migrations and entity definitions using Java and Spring Boot, enabling efficient backend integration and data management. Alec also developed and refined React components, including CRUD scaffolding for user pages and improved navigation menus, while addressing test stability and code hygiene with Jest and React Testing Library. His work focused on both frontend and backend development, delivering nine features and resolving six bugs, demonstrating depth in full-stack engineering and test-driven workflows.