MediaWiki skin upgrade from version 1.23 to 1.30

I need to upgrade a MediaWiki (wikipedia CMS) skin from version 1.23 to 1.30 The code needs to be as clean as possible. The new skin version can be deployed using composer The coder will need to be able to deploy the new skin on a fresh MediaWiki installation over a remote connection and give guidance through the installation process I am a technical person and I can be specific about my needs, I need someone technical who speaks and understands English at an intermediate level both in writing and speech. This is not an easy task, don't underestimate it. This is just one task from a larger project and I hope to find someone that I will work with for a while