Build an Online Store

I have a website www.jewellerkaka.com. I need a coder to help me implement some technical and design changes from time to time. Also if there is some or the other problem at other various times then they should be able to help me out with that. Also need to Migrate the server from VPS to Digitalocean(which is a naked Server). So will have to monitor the server in case of any issues. Also the personnel should have so experience of working on opencart with customised Php.