Text for a website

We require someone to re-write the text on our website to a high standard with SEO in mind, but most importantly to be presentable and interesting for our customers. The text is already on the website, but it needs to be edited by a professional writer. We also need some new text for the new categories in the website which are coming soon. We would like to use the same person in the future as well, when we are adding new text for the website and also for some content writing eventually.