Fix NFT Raffle Platform Issue

I'm seeking a skilled full stack developer to collaborate with my in-house developer to resolve multiple issues on our NFT Raffle platform.

Key areas of concern include:
- Performance problems
- Security vulnerabilities
- User interface bugs
- Functional problems like raffle draw issues, payment processing errors, and user registration/login issues

Ideal Skills & Experience:
- Strong background in both front-end and back-end development
- Experience with NFT platforms and blockchain technology
- Proven track record in identifying and fixing security vulnerabilities
- Ability to enhance performance and resolve UI bugs
- Experience with payment processing systems and user authentication

Please provide a portfolio demonstrating relevant experience.