NodeJS & ExpressJS Project Modifications

I'm looking for a proficient developer who can modify my existing NodeJS, ExpressJS project. The project requires the addition of a new 'Promotion Feature', alongside fixing a few bugs and implementing some performance improvements.

Key Requirements:
- Implementation of a new 'Promotion Feature'
- Troubleshooting and fixing of functional and UI/UX bugs
- Enhancing the overall performance of the application

Ideal Skills:
- Exceptional knowledge of NodeJS and ExpressJS
- Strong debugging and problem-solving skills
- Experience with UI/UX improvements
- Ability to enhance application performance

Please see the Attached Document file for the issue.

Let's make this project a success together!