Struts1 to Struts2 Upgrade for Web App

I'm in need of a seasoned Java Struts expert to assist with upgrading the backend logic of my web application from Struts1 to Struts2.

Key Requirements:
- Proficient in Java and Struts framework
- Extensive web application development experience
- Prior experience with Struts1 to Struts2 upgrades

I have comprehensive documentation for the backend logic that will greatly facilitate the upgrade process.