Sr. Developer for ASP.NET MVC architecture

On going project in asp.net mvc, jQuery, Web API, SQL Server. I need someone help to fix the authentication and authorization module in the project architecture. Also need assistance in securing web s On going project in asp.net mvc, jQuery, Web API, SQL Server. I need someone help to fix the authentication and authorization module in the project architecture. Also need assistance in securing web site.Agencies are not allowed; only independent freelances may submit applications.