Blog Website Optimization & Upkeep

I run a content-heavy blog and need an experienced web developer to keep everything running smoothly while we grow. Right now the site loads slowly, a few pages sometimes break, and adding new features or even new pages feels clunky... (Budget: £20 - £250 GBP, Jobs: Content Management System (CMS), HTML, PHP, SEO, Web Application, Web Development, Website Design, Website Optimization, WordPress)