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ExtJS & Sencha developers
Ext JS is a pure JavaScript application framework for building interactive cross platform web applications using techniques such as Ajax, DHTML and DOM scripting
Sencha Touch is a user interface JavaScript library, or web framework, specifically built for the Mobile Web
Table of contents
Code
Community
People you should know
Please find the ArcGIS Experts (story tellers and developers) on this topic here: https://esri-es.github.io/arcgis-experts/?topic=Sencha
They don't work on the support team and some may even not work at Esri, but they are opening some projects and sharing insights related to this technology so we recommend you to follow them.
More resources
We recommend you to take a look to:
Here you will find a lot of interesting resources to learn an improve your skills with ExtJS/Sencha: