Custom Responsive Website Build

I need a full-stack web solution built from scratch. The site must be fast, fully responsive, and easy for me to update without touching code. I will supply the sitemap and wireframes at kick-off; the design can follow a modern, clean aesthetic that works well across desktop and mobile... (Budget: $1500 - $3000 USD, Jobs: Backend Development, CSS, Frontend Development, HTML, PHP, Web Development, Website Design, WordPress)