As an Extjs Developer, you will primarily focus on designing, coding, and maintaining complex user interfaces using the Ext JS framework. Your daily tasks often include developing new application modules, troubleshooting and optimizing legacy code, integrating APIs, and collaborating with other front-end and back-end developers to ensure seamless application functionality. In addition to coding, you may be involved in code reviews, UI/UX improvements, and participating in agile sprint planning or team meetings. This role requires close collaboration with QA testers, project managers, and designers to translate business needs into effective technical solutions.