All Services Programming & Development ExtJS JavaScript Engineer $75/hr · Starting at $25 I am a long-time front-end web developer with over 15 years experience developing both small and large-scale enterprise applications. My primary focus is ExtJS applications. I have worked 2.5 years as a Sustaining Engineer for Sencha contributing directly to the ExtJS framework for versions 4.2 - 6.5. I can provide custom component development, code upgrades and integrations. My experience and services also range from best coding practices to unit testing and code performance reviews. About $75/hr · Ongoing Download Resume I am a long-time front-end web developer with over 15 years experience developing both small and large-scale enterprise applications. My primary focus is ExtJS applications. I have worked 2.5 years as a Sustaining Engineer for Sencha contributing directly to the ExtJS framework for versions 4.2 - 6.5. I can provide custom component development, code upgrades and integrations. My experience and services also range from best coding practices to unit testing and code performance reviews. Skills & Expertise App DevelopmentCodingComponent DevelopmentEngineeringExt JSExtjsFramework DesignFront End DevelopmentJavaScriptPerformance EngineeringReactJSReview WritingSenchaSoftware DevelopmentUnit TestingWeb Development 1 Reviews This Freelancer has not received any feedback. Browse Similar Freelance Experts Framework DesignersWeb DevelopersJavaScript DevelopersPerformance EngineersFront End DevelopersComponent DevelopersWeb Application DevelopersEngineersReview WritersSoftware DevelopersReactJS DevelopersExt JS Developers