Detailed analysis of US mortgage lending process

We would like someone with a detailed understanding of the Mortgage process in the US to conduct a very detailed mapping of the US Mortgage process concentrating on the Lending aspect from Bank or Fintechs perspective.
We would want the consultant to.
1. Map a detailed process flow of how an individual applies for a mortgage loan to what are the criteria, documents, information etc. that the lender collects to process the loan.
2. What are the different ways in which the information and documents are currently provided/collected
3. Map the time taken and pain points in the current process from the customers and banks perspective.
4. Identify the opportunities in automating some of the processes to make it simpler and faster to take decisions.
5. Detailed mapping of what are some of the new-age lenders are doing to optimize their processes and operations.