PHP Expert for Feature Development

I'm seeking a skilled PHP expert to work live on our server via FTP for 4 hours daily. The role is compensated at 200 INR per hour.

Key Responsibilities:
- Developing a user authentication system
- Debugging and fixing logical errors and performance issues
- Maintaining and enhancing our existing codebase

Ideal Skills and Experience:
- Expertise in PHP
- Strong debugging skills, particularly with logical and performance issues
- Experience in developing user authentication systems
- Familiarity with working on live servers via FTP

Please provide your portfolio and relevant experience.