- Consulting and developing on new technological solutions- Design and architecture of networking solutions- Supervisor and technical lead of technical divisions- Participating in complex deployments that require high level of experience and specialization- Design and composition of technical proposals- Design and implementation of internal technical trainings

- Implementation engineer on Cisco ACI project in the banking sector.- Technical Lead Engineer and mentor to junior network engineers. Collaborated closely with technical project managers (TPM).- Designed and implemented the core infrastructure of the Hellenic National Meteorological Service with Huawei CloudEngine series Data Center switches. This included one primary and one secondary hub HQ site and 40 spoke sites with meteorological stations. Technologies: VRF lite, MP-BGP, OSPF, route policies and redistribution, M-LAG, DMVPN, IPSec, QoS and many more. - Produced HLD and LLD documents.- Automated the massive production of configuration scripts for network devices using Python.

+ Assigned to Vodafone IP LAN Engineering & Delivery team as outsourcing external engineer.- Developing Python scripts to automate clean-up configuration development for Vodafone firewalls (Cisco, Fortinet, Juniper).- Provided consulting and produced High Level Designs on firewall defined Security Zoning and routing solutions, regarding Vodafone’s sites inter-connectivity via L3 MPLS VPNs and VRF environments- Planning, designing and managing the incorporation of Vantage Towers office LANs into Vodafone network.- Handling day-to-day tickets and producing work orders, configurations and solutions according to customer demands.- Participating in several projects and collaborating with Vodafone Group engineers and managers.- Exposed to service provider network functions, procedures and workflows.- Produced network documentation and diagrams.

CCNA (ver 7.0) Instructor. Teaching modules: 1) Introduction to Networks 2) Routing, Switching and Wireless essentials 3) Enterprise Networking, Security & Automation.

Fuelics was created by Fresset and SNV Engineering companies to create and promote NB-IoT sensor products.Please see SNV Engineering below for additional experience during the same period.- Organized, hosted and participated in worldwide technical meetings between Fuelics and partners such as Cosmote, Nokia, Ericsson and Vodafone.- Collaborated closely with Senior Software Engineers of various IoT platforms such as Ericsson’s IoT Accelerator, Nokia’s Impact and SenseOne’s IoT platform. I helped in establishing the networking communication between the Fuelics sensors and the IoT platforms by designing and implementing simple application communication protocols. As a network engineer expert, I helped on the well-deployment of several pilot projects on NB-IoT.- Represented Fuelics at various events such as the “Smart University Campus” (24 Apr. 2018) organized by the Democritus University of Thrace and with collaboration of OTE group, and events about “Smart Cities” organized by candidate mayors for the 2019 municipality elections in Greece.

- IoT Networking Consultant. - Senior Network Engineer.- R&D Engineer, firmware developer on embedded systems.- Systems Administrator.- Internships supervisor.

“Smart NS” is a Cisco Certified Premier Partner and offers integrated network solutions. My role was in designing, implementing, troubleshooting and offering technical consulting in the following areas: advanced routing and switching, network security, LAN and Wireless LAN, WAN connectivity, network maintenance, network administration and structured cabling.- Proposed and implemented routing solutions for complex scenarios on redundant topologies utilizing advanced routing protocols and techniques such as EIGRP, OSPF, route redistribution and filtering.- Responsible for securing our clients’ networks by implementing Cisco IOS statefull firewalls like Zone Based Policy Firewalls, CBAC and deploying Cisco Adaptive Security Appliances (ASA firewalls).- Implemented site-to-site and remote access IPSec VPN technologies on Cisco routers and ASAs.- Responsible for resolving difficult troubleshooting cases by utilizing a variety of tools such as Cisco IOS “show” and “debug” commands, packet analyzers like Wireshark and network mapping tools such as Nmap and Cisco CDP.- Designed and implemented LANs using the Cisco Hierarchical Structure Model and implemented VLANs and STP/RSTP. Configured backbone links using LACP/Etherchannels and 802.1q tagging.- Responsible for conducting Wireless LAN site surveys. I designed point-to-point wireless bridge connections. Implemented and maintained Cisco Lightweight Access Points with Wireless LAN Controllers.- Responsible for researching and introducing new technologies to our team in order to offer them as services to our clients, setting up labs for testing and implementing proof of concept scenarios.- Designed and supervised structured cabling installations and was responsible for team coordination and delivering network documentation.

I taught the Cisco Academy courses “Cisco Certified Networking Associate” (CCNA) and “Fundamentals of Wireless LANs” (FWL). I also trained CCNA Instructors and I was assigned duties of a Cisco Regional Academy Inspector. Key topics of my lectures were:- Networking Fundamentals, OSI model and TCP/IP protocols.- Routing concepts, RIPv1, RIPv2, IGRP, EIGRP, OSPF and static routes.- LAN design, Ethernet, switching and catalyst switches, 802.1q, spanning tree (STP/ RSTP) and LAN security.- WAN connectivity, ISDN, Frame Relay and PVCs, Network Security (Cisco IOS ACLs), NAT/PAT.- Wireless concepts, access points, wireless bridges, wireless security.