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Luis Sismeiro is a seasoned Voice & Services Engineer at Truphone since April 2012, specializing in international mobile communications and the management of multiple regional numbers through a unique SIM card. Prior experience includes a role as Systems Consultant at PRIMEIT CONSULTING SA from June 2007 to March 2012, focusing on Unix, Linux, and Telecommunications services such as Voice Mail and IPTV. Earlier, Luis served as a Systems Consultant at Altran Portugal from November 2004 to May 2007, providing expertise in Unix, Linux, and various telecommunications platforms, as well as IBM technologies. Luis holds a Licenciatura in Engenharia de Sistemas e Computação from Universidade do Algarve, completed in 2001.