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Callahan C. A. has a diverse work experience spanning various roles and responsibilities. They began their career in 2002 as a Junior Software Engineer at VB Banking. After that, they worked as an Information System Manager at the same company from 2004 to 2006. In 2008, they joined VB Banking again, this time as a Human Resources Information System Analyst, and stayed there until 2011.

In 2012, Callahan C. A. started working as a Software Engineer at Hazelcast for a period of two years. They then moved to Aurea Software in 2015, where they initially held the position of Software Engineer and later transitioned to the role of Software Architect from 2017 to 2019.

Most recently, Callahan C. A. has been employed at NioyaTech LLC, starting in 2019 as the Chief Technology Officer. They then became the Chief Executive Officer in 2021 and, currently, hold the position of Chief Operating Officer since April 2022.

Overall, Callahan C. A. has gained extensive experience and expertise in software engineering, information systems management, and leadership roles throughout their career.

Callahan C.A. obtained a Bachelor's degree in Computer Engineering from Istanbul Technical University from 1998 to 2002. Following this, they pursued a Master's degree in Human Resources Management/Personnel Administration, General at Purdue University, graduating from 2006 to 2008. They furthered their education with a Master's degree in Organizational Leadership at NSU, completing their studies from 2009 to 2011.