Solar Business Website & Mobile App

I need a comprehensive website and mobile app for my solar business under one domain. The platform should feature three main options:

- AMC Services
- Solar Panels Business / Expansion
- Other Service (Coming Soon)

Both the website and the app should be clean, modern, mobile-friendly, and easy to manage.

Essential features include:
- User authentication
- Payment gateway
- Feedback form

Ideal skills and experience:
- Expertise in web and mobile app development
- Experience with user authentication and payment gateway integration
- Strong UI/UX design skills for a modern, mobile-friendly interface
- Proven track record in delivering similar projects

Please provide detailed project proposals in your application.