Responsive Web App Development

I am looking for an experienced web developer to build a modern, responsive, and professional website/web application.

Project requirements:
- Modern and clean UI/UX
- Fully responsive design for mobile, tablet, and desktop
- Fast loading and optimized performance
- SEO-friendly structure
- Clean and maintainable code
- Secure backend and database integration where required
- Admin/dashboard functionality if required
- API integrations where required
- Proper form validation and error handling
- Deployment to Vercel or another suitable hosting platform
- Source code must be provided through GitHub

Preferred technologies:
- Next.js / React
- TypeScript
- Tailwind CSS
- Node.js
- Supabase / PostgreSQL

The developer should be able to understand requirements, suggest improvements, implement the project professionally, test everything properly, and fix bugs before final delivery.

Please include:
1. Examples of similar projects you have completed
2. Your estimated timeline
3. Your total project cost
4. Technologies you recommend
5. Details about post-delivery support

I am looking for someone who can deliver high-quality, production-ready work rather than just a basic template.