I will make use of a technology called Ruby on Rails. It simplifies the process of creating the system in three layers. My work will need some extra information from you to gather other requirements to make this system what you want.
In the first two days: Create users and companies, validations and functionality
In the 3rd and 4th days: Basic features (filter, sort, sign up)
In the 5th day: First Demo, test and fixes.
In the 6th day: Second Demo, test and fixes.
JuanM.