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Lubos Krejcir has a diverse work experience spanning over several years. Lubos began their career at ABB as a Sales Support from April 2007 to August 2011. Lubos then worked at NSC Global as a Tier 2 Support Analyst from September 2011 to February 2014. Following that, Lubos joined AT&T as a Tier 2 Network specialist from March 2014 to July 2015. Lubos later joined SecureOps, where they held various roles. From August 2015 to August 2017, they worked as a Network Security Engineer, providing support for a wide range of security devices. From August 2017 to September 2018, they served as a Senior Network Security Engineer, responsible for maintaining routing protocols in large networks and working with various technology vendors. Currently, Lubos holds the position of Network Security Architect at SecureOps.

Lubos Krejcir completed their education at the University of Technology Brno from 2005 to 2011, earning a MSc. (Ing.) degree in Communications and Informatics. In addition to their degree, Lubos Krejcir has obtained certifications from various institutions including Cisco and CompTIA, such as CCNA 640-554 IINS, CCNA 640-802, CompTIA Security+ ce, and Palo Alto Networks PCNSE. However, specific information about the months and years when these certifications were obtained is not available.