Full Stack Developer for SaaS and Website

I need a full stack developer to create a SaaS app and a website.

Essential Requirements:
- Core functionalities: User management, Payment processing, Reporting and analytics.
- Platforms: Must support both desktop and mobile.
- Integration: Website and SaaS app should ideally be integrated, but I'm open to suggestions.

Ideal Skills:
- Strong experience in user management and payment processing systems.
- Expertise in responsive design for both desktop and mobile platforms.
- Proficient in backend and frontend development.

Looking forward to your bids!