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필성 장 has a diverse work experience in the technology industry. They started their career at SNET Systems in 2000 as a System Engineer and worked there until 2006. After that, they joined Acme Packet in 2008 as a Sales Engineer and remained in that role until 2013. In 2013, they transitioned to Oracle as a Principal Sales Consultant and worked there for almost eight years until 2021. Currently, they are employed at AudioCodes as a Sales Engineer.

필성 장 attended Korea University of Technology and Education from 1993 to 2000, where they pursued an Engineer's degree in Electrical and Electronics Engineering.