make my website mobile friendly

Hello, I am looking for someone to help make my website mobile friendly. The current platform and technology I am using for my website is 'OpenCart', so the successful freelancer will have wide-ranging technical expertise. I would like to maintain the current design, so that part of the job is already sorted. Additionally, I am not looking for any additional features in the mobile version - I simply want to make it responsive. If you think you have the skillset and experience necessary to make this happen in a timely, professional manner, then please get in touch! Thank you.