Performance Management Tool Development

I'm seeking a skilled developer to create a web-based performance management tool. This tool is essential for streamlining our appraisal process and enhancing employee feedback mechanisms.

Key features must include:
- Increment scales
- Manager rating
- Normalisation
- Increment percentage correction
- Feedback letters to employees post-appraisal

User Roles:
- Employees
- Managers
- HR Administrators

User Authentication: Email and password

Ideal Skills and Experience:
- Experience in developing web applications
- Strong understanding of performance management systems
- Proficient in implementing secure authentication methods
- UI/UX design skills for a user-friendly interface
- Background in HR tech solutions is a plus

Please provide a portfolio with relevant projects.