SaaS Web App

I'm looking for a full stack web developer to build an HTML/CSS/JS/PHP/MySQL SaaS site. I'm looking for a professional & visually pleasing minimalistic design.

The app will feature: 

Landing page with app description pricing plans and login functionality
Desktop and Tablet optimised. Mobile friendly especially for the landing page
Registration functionality with email confirmation prior to account activation
Rapid Email delivery at account registration and password reset (as rapid as can be for the shared hosting solution in use)
Free tier and paid tiers of the app with multiple payment methods available (e.g. Visa, MasterCard and Google Pay etc.)
Secure (e.g. data at rest and in transit will be encrypted. Shared hosting service is SSL enabled)
App (once registered and logged in) will give the user the ability to change their tier from lower tiers to higher tiers. Higher tiers will allow users to invite other users.

The app's basic functionality has been developed and is online.