I worked for 12 years on P&D projects in private companies and with a researcher/professor at the Federal University of Ceara. The main projects were a Next Generation Access Platform for delivering voice and data services in distant areas, MSAN (Multi-Service Access Gateway), responsible for implementing the SIP (Session Initiation Protocol) protocol stack for voice-over-IP services, and the firmware leader for implementing DWDM optical network equipment, such as optical amplifiers, optical switches (WSS - Wavelength Selective Switch), 100G coherent modules, CFP2 200G, all for optical networks. Main areas of interest: Cellular telephony, IP telephony, computer networks, communications protocols, embedded systems, real-time OS (Linux, MQX, freeRTOS, and VxWorks), VoIP, wireless sensor network, C/C++ programming and systems of optical communications.