In April 2025, Faris Hadzimusić developed the core user authentication system for the AnandPap321/informacioni-sistem-za-aviokompanije repository, focusing on login and registration flows. He implemented asynchronous JavaScript functions that integrated the frontend with backend APIs using axios, enabling secure credential handling and robust error management. By connecting the user interface to the authentication endpoints, he improved onboarding user experience and established a scalable foundation for future enhancements. The work demonstrated proficiency in API integration and frontend development, delivering a complete end-to-end authentication feature that supports secure access and session management without addressing explicit bug fixes during this period.