Hi,
Change link to external page in aspx pages is not big task and can be solved easily.
Below is about my experience and skills in Asp.Net. if you think my experience is best for your requirement then let's start it.
I have done lot of projects in Asp.Net MVC with database MySQL, Sql Server and MongoDB and have more than 6+ years experience in Asp.Net.
* Asp.Net CORE 1.0, 1.1 and 2.0
* Asp.Net MVC, Silverlight, WPF
* Asp.Net Webforms-Aspx extensions
* Angular JS 1 , 2 and 4 version
* SQL server, MySQL, MongoDB
* Css/ Html /Sass /Jquery /Bootstrap
* Entity framework
* Web Api, Web services, WCF services
* Agile/scrum methodology for task management
* Window azure and IIS for hosting environment
Looking forward hearing from you.
Regards
Rahul Rana