Responsive Landing Page Design

We are looking for someone to take over a project that is mid-stream development. You will need to review the existing PHP code and follow someone else's work quickly that manages responsive landing pages. The pages should be visually appealing and optimized for conversions. The ideal candidate will have experience in web design and PHP development. The industry / products are in the plumbing mechanical space. The system is live and useful today. We feel we are at 40% of the project completion. Something has happened with our developer as they have been non-responsive for a week now. Inquire and we will give you a synopsis so you may evaluate the project.