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Christien Mattiassi has extensive experience in IT and systems administration, currently working as a Systems Administrator at PMB Defence Pty Ltd since June 2023. Prior to this role, Christien served as a Senior ICT Systems Engineer at Next Solutions for a brief period in May to June 2023. From September 2011 to January 2023, Christien was an Infrastructure Engineer at PowerHealth Solutions. Additionally, Christien owned and operated C & S I.T Computer Systems from November 2007 to August 2013.