Selected intern's day-to-day responsibilities include:

1. Collaborate with the development team to design, develop, and deploy web applications using JavaScript, ReactJS, Python, MySQL, and HTML
2. Assist in the implementation of new features and enhancements, ensuring high performance and responsiveness of the applications
3. Conduct thorough testing and debugging to identify and fix any issues or bugs, ensuring a seamless user experience
4. Optimize applications for maximum speed and scalability, while maintaining clean and efficient code
5. Collaborate with designers to translate UI/UX wireframes into functional web pages, providing an exceptional visual experience
6. Stay up-to-date with industry trends and emerging technologies, bringing new ideas and best practices to the team
7. Support the team in various development tasks and contribute to the overall success of the Faith App platform