Full Testing, Mobile Phone resolution & Mobile Responsiveness for Opencart website

I have a open cart e-commerce website [login to view URL] Website is running since several years but has some bugs in it. I have following requirements. Please understand details clearly and be ready to discuss things before choosing the freelancer for job - Website has to be tested in detail For Desktop/Laptop & Mobile phone. Test report need to be shared in professional ways. Development team will work on issue fixing and need to support till issues are fixed. - Mobile Layout issues- This need to make detailed test report. Then, need to fix these issues on all key resolutions of phone. Once fixed, need to give final test report. - Mobile responsiveness issue- iOS & Android- This has to be given detailed test report, then issue fixing on phone. Website has to be very good performance on phone. - Final Testing & reporting for full website. Make sure website is bug free. - Additional features/improvements in website for better sales are welcome. - We have to refer some professional tool to judge and guage the website performance finally on desktop and mobile. This will be reference point. So, project will be done in phases as mentioned above and payment need to be done in phases as well. Team must be professional and should be able to reply queries in detail and work in efficient way. Please ONLY BIG if you are experienced enough in such project and can do detailed work. Website is up & running business, so person/team should be professional enough to handle such things. Skills Required