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John A. Kallergis has a diverse work experience spanning from 2011 to 2019. From 2011 to 2015, they worked at eGalaxy LTD as a Graphics Designer and eCommerce Assistant, at Troosk.gr as a Graphics Designer, Social Media & eMail Marketing, and eCommerce Assistant, and at BestMarket.gr as a Graphics Design, Social Media, and eCommerce Assistant. In 2017, they worked at ATCOM Internet & Multimedia S.A. as a JavaScript Developer, and in 2019 they worked at ARHS Developments Hellas as a Software Engineer and at Limbic as a Lead Software Engineer and Software Engineer. During their freelance and personal projects, they were responsible for the engineering of an open source solution for ElectronJS, developing and maintaining an open sourced React-Native boilerplate, and maintaining an open sourced React-Native module.

John A. Kallergis attended Intergraphics in Athens from 2008 to 2010, where they studied 3D Animation. John A. also attended 2nd High School of Rethymno. In addition, they have obtained certifications from Udemy, Lynda.com, and EF Education First, including The Complete Google AdWords Course, Foundations of Programming: Object-Oriented Design, and EFSET EXPRESS High Proficiency (CEFR C1/C2).