Need expert to quickly add 2FA to an existing Java/MSSQL, application site login system.

This is a request for someone who has done this before or is confident enough to give a fixed price quote for implementing the addition of a no-cost, Java-based integration of two-factor authentication (2FA) with an existing Java Application that utilizes a Windows Server 2012r2 and SQL Server backend. The stack includes Netbeans, Apache Tomcat, and IIS 8.5.