Comprehensive Usability Testing for Web & Mobile

I'm looking for a professional usability tester to assess my WebApp, Mobile Apps, and Landing Page. The focus of the test should be on navigation, content layout, interaction design, and functionality. The ideal candidate should have experience in conducting manual usability tests and be able to provide detailed feedback on these areas.

Key Requirements:
- Expertise in usability testing for web and mobile platforms
- In-depth knowledge of assessing navigation, content layout, interaction design, and functionality
- Experience in testing for new users
- Ability to provide comprehensive, actionable feedback
- Excellent understanding of UI/UX principles