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Frank Ruizendaal has extensive experience in customer service and technical engineering, currently serving as a Senior Customer Service Engineer for Optical at Telindus Nederland since February 1999. In this role, Frank has specialized in the installation, configuration, and testing of SDH and DWDM systems, including expertise with Ciena and Transmode/Infinera technologies. Prior to Telindus, Frank held various positions, including Senior Customer Service Engineer at Kos en Kroon Huizen BV, where installation of electrical and security systems was a focus, and as a Security Technician and Electro Representative at R&M Scherpenzeel and Schotman Electro BV, respectively. Frank's career began as a Technical Employee at Skala and an Inside Sales Representative at Alcoo BV, demonstrating a diverse background in both technical and customer-facing roles.