Full Stack UI/UX Developer for AI Interview App

I am looking for a seasoned full stack developer with a strong UI/UX background to create a new web application from scratch. The application will leverage artificial intelligence to simulate interview scenarios.

Key Features:
- Craft a seamless, intuitive, and engaging UI/UX that caters to all user types.
- Develop a robust back-end infrastructure capable of supporting the application's AI functionalities.
- Implement user authentication to secure personal data and track user progress.
- Integrate payment processing for premium features, ensuring a smooth transaction process.
- Include real-time notifications to enhance user engagement and experience during interviews.

The ideal candidate will have:
- Extensive experience in full stack development, particularly with web applications.
- A strong portfolio showcasing previous UI/UX design work.
- Experience creating AI-integrated applications is a significant plus.
- Proficiency in implementing secure user authentication and smooth payment processing.
- Ability to create engaging real-time notifications.

Please ensure your proposal includes relevant examples from your portfolio.