UI/UX Usability Audit for Web App

I need a comprehensive usability audit for a new web app intended for internal testers. The focus areas are:

- Navigation: Evaluate and enhance the intuitiveness and efficiency of the navigation structure.
- Forms and Inputs: Analyze and improve the usability of forms and input fields to reduce errors and enhance data entry speed.
- Accessibility: Ensure the app meets accessibility standards, making it usable for all employees, including those with disabilities.

Ideal Skills and Experience:
- Expertise in UI/UX design principles, especially usability.
- Experience with usability testing and analysis.
- Strong analytical skills to provide actionable recommendations.
- Experience in developing UX for Enterprise applications/ Developers/Testers will help

Please share your relevant experience and approach.