I've authored 3 books on Ext JS and would be happy to discuss your project.
I have been building web applications for over 10 years. Projects and clients range from small startups to enterprises. I've seen and solved a lot of problems over the years and would be happy to pass that knowledge on.
I have worked with Ext JS for over 5 years and have authored 3 books on the subject - Ext JS 4 Cookbook, Ext JS Essentials & Ext JS 6: Getting Started. I've worked on a huge variety of projects using the framework and would be delighted to help you with yours.