The Systems Engineer - Optical Network Presales is responsible for managing the technology proposition and evaluation stage of the sales process, articulating technology and product positioning, and maintaining strong customer relationships. Key responsibilities include managing technical demonstrations, designing networks, supporting marketing activities, responding to RFIs/RFPs, and providing after-sales support. The ideal candidate must have an engineering degree, experience in the telecommunications industry, and expertise in optical network architectures, packet/optical networks, and network management.