Angular.js Front End Developer Needed

I'm seeking a skilled Front End Developer with expertise in Angular.js to help me update an existing website/app. The primary focus will be enhancing the functionality and optimizing the performance.

Key Responsibilities:
- Improve and update the site's functionality and features.
- Optimize the website/app for peak performance.

Additionally, I want to add or improve specific functionalities:
- Enhance the User Authentication process.
- Implement and upgrade Interactive Elements.

Ideal Candidates Should Have:
- Proven experience with Front End Development, specifically using Angular.js.
- Strong skills in performance optimization.
- Prior experience with improving user authentication systems.
- Capability to design and implement interactive elements.