QA Testing and UX Review for Chemical Engineering Website

I have a chemical engineering website already made that needs to be quality assured. I would like to hire someone to look over the site, find any bugs or usability issues and suggest improvements. As it is a chemical engineering website, I will need someone with some knowledge of the industry and the relevant technical terms and processes. I want to ensure that the website is functioning correctly and is displaying all information in a correct and accessible manner to engineers and other professionals. The person must be able to test all functions and identify any issues that may arise when using a computer and mobile device. The person does not need to make any changes to the site, simply report and illustrate any problems with the website and suggest any improvements that they feel would be helpful. My budget for this job is 150$ and it should be completed within 2-3 days. When applying, please leave a small message saying a bit about your QA testing experience and any relevant experience in the chemical engineering field or any similar industries.