Multi-platform Social Network & Marketplace

I'm looking to create a modern and minimalist social network and marketplace integrated into a website and mobile application (for both Android/iOS and desktop).

Key functionalities include:
- User accounts and login
- Shopping cart and checkout
- Payment gateway integration
- Additional features are detailed in the attached summary document

Ideal Skills & Experience:
- Proven experience in developing social networking and e-commerce platforms
- Strong expertise in mobile and web application development
- Proficiency in modern UI/UX design principles
- Familiarity with secure payment gateway integrations
- Ability to deliver projects within budget and timeline

Please provide a portfolio showcasing similar projects.