Need Progress web app ( large scale project)

We are looking for top design and development agency to create a huge project for us, we need to create a real estate (prop tech) progressive web app (PWA) in reactive and amazon services, that will allow users to use on desktop and mobiles seamlessly. This will allow agents to create profile and list and manage their properties, customers can view different types and explore properties. we will not connecting customers and property sellers, all inquires should come to agent panel where they can check leads, and call back customers to follow up, negotiate and close deals and make property transfer. they will have what’s app and VOIP integrated to quickly call and update inquiry statuses, we need to manage heat maps, recommendations, price vs size, loan eligibility. there will be 200 agents in 5 major cities to handle all inquiries, there will be following roles in system: customer, property seller individuals, real estate agencies, Our Agents ( with access control list), Super admin. the best example is [login to view URL] go through it in details but we will add more advanced features and design. this project will be used by million of users and your experience with large scale project is very important. it must be tested for QA and security. transfer complete assets and codes to our team upon completion.