Full Stack Developer for Dual Platform App

I am seeking a skilled Java Spring Boot developer to create a comprehensive web and mobile application.

Key requirements include:
- Development using Java Spring Boot
- Experience with both web and mobile platforms
- Implementing core features such as user authentication, real-time updates, and payment integration

Ideal Skills and Experience:
- Strong proficiency in Java and Spring Boot
- Experience with mobile app development frameworks
- Knowledge in setting up user authentication systems
- Ability to integrate real-time updates and payment gateways

Please provide examples of similar work done and outline your approach to ensure a seamless user experience across both platforms.