Dimitrios A. Katsaros Email & Phone Number

Saudi Arabia, Abqaiq

Areas of cyber security / infrastructure assessments include: Secure process control systems and PCN devices by establishing and enforcing security policies and standards. Identify and report security issues and taking corrective actions to resolve issues in accordance with established company`s policies and procedures.Utilize Splunk to monitor and analyze metadata throughout various process control networks and DMZ infrastructure, monitoring of logs, investigation of… Show more Areas of cyber security / infrastructure assessments include: Secure process control systems and PCN devices by establishing and enforcing security policies and standards. Identify and report security issues and taking corrective actions to resolve issues in accordance with established company`s policies and procedures.Utilize Splunk to monitor and analyze metadata throughout various process control networks and DMZ infrastructure, monitoring of logs, investigation of incidents, assist in monitoring device failures.Perform regular O&M functions such as problem management, systems backups, configuration management, system documentation and reporting.Maintaining, configuring, and monitoring virus protection software and WSUS platforms.Ensure system reliability and accessibility by preventing and defending against unauthorized access to systems.Provides oversight and support for the planning guidance, and operational support of the site cyber security infrastructure which includes among others SIEMS, vulnerability and compliance scanners, DMZ networking components, DMZ servers and operator workstations.Participation in regular assessments to ensure industrial information systems security policies and procedures are being implemented as defined by IT security standards and policies.Maintenance of Juniper/Cisco Firewalls, PCN and DMZ network devices.Virtualization with Vmware ESXi.Intrusion Detection and Prevention systems.Ensuring availability of Plant systems and PCN devices by NMS WhatsUp Gold.Access Control Management.Disaster Recovery Plans implementation.Maintaing systems compliance by monitoring security controls through Tripwire Configuration Compliance Manager. Show less

Saudi Arabia, Abqaiq

Saudi Arabia, Abqaiq

Athens, Greece

JOB POSITION: IP NETWORK TEST ENGINEER, DEPARTMENT OF STRATEGY & ARCHITECTURE NETWORK, DIVISION OF CORE NETWORK LABORATORY, Psalidi.Testing and verification, troubleshooting, interoperability tests of network equipment and services in a laboratory environment.Main Duties:• Extensive use of Test & Measurement hardware named Spirent Test Center 9000A Traffic generator / analyzer to verify proper operation of network protocols and network behavior in cases of high traffic… Show more JOB POSITION: IP NETWORK TEST ENGINEER, DEPARTMENT OF STRATEGY & ARCHITECTURE NETWORK, DIVISION OF CORE NETWORK LABORATORY, Psalidi.Testing and verification, troubleshooting, interoperability tests of network equipment and services in a laboratory environment.Main Duties:• Extensive use of Test & Measurement hardware named Spirent Test Center 9000A Traffic generator / analyzer to verify proper operation of network protocols and network behavior in cases of high traffic loads.• Emulate the Core Network of OTE in a lab testing environment and implement various test case scenarios before applying changes on the live network. • Implement networking technologies into the Core network of OTE such as L2VPNs, L3VPNs, Ethernet over MPLS, OSPF, BGPv4.• Execute interoperability tests between different networking equipments, performance and stress tests analysis• Evaluate network systems after completion of acceptance tests• Document final reporting of test results and debugging information, making presentations of results to High level management of OTE Group.• Participate into IP-VPN Deployment projects for potential customers of OTE (eg Private sector Banks).• Configure and troubleshoot CPEs of different vendors such as Cisco, Huawei, HP, Alcatel.• Participation in Vendor Evaluating teams for vendor selection in technical projects. Show less

Athens, Greece

Job Position: Network Administrator – Department of Network and Services of OTE Group. Perform a variety of maintenance, evaluation, installation tasks to ensure LAN/WAN performance meets company and user requirements.Job title: Network Administrator – Department of Networks & Services of OTE Group. Perform a variety of maintenance, installation tasks to ensure LAN/WAN availability and performance meets company and user requirements.Main Duties:• Administrate the network… Show more Job Position: Network Administrator – Department of Network and Services of OTE Group. Perform a variety of maintenance, evaluation, installation tasks to ensure LAN/WAN performance meets company and user requirements.Job title: Network Administrator – Department of Networks & Services of OTE Group. Perform a variety of maintenance, installation tasks to ensure LAN/WAN availability and performance meets company and user requirements.Main Duties:• Administrate the network infrastructure at all layers Core, Distribution & Access layer, ensuring uptime and availability.• Investigate user and network problems, identify their source, determine possible solutions, test and implement solutions. • Manage network operations to include: troubleshooting connectivity problems; installing & maintaining routers and switches; Perform routine preventive maintenance on hardware and software.• Install, configure, and maintain new networking equipment, Ethernet networks, devices, and systems; • Plan and implement network security policies into new installed systems.• Troubleshoot WAN/LAN links, systems, and applications to identify and correct malfunctions and other operational difficulties.• Establish and perform maintenance programs following company and vendor standards.• Ability to resolve network connectivity issues and determine when and whether adjustments need to be made by using NMS tools such as Cisco Works2000, Cacti, Whats Up Gold, Nagios.• Document network problems and resolutions for future reference. • Recommend changes to improve systems and network configurations, and determine hardware or software requirements related to such changes. Show less

Athens, Greece

Vocational Training on the following courses:Comptia A+ ECDL IT AdministratorCisco IT Essentials

Athens

Vocational Training on the following Courses:Computer Science FundamentalsData Communications & Internet Principles

Athens, Greece

Job title: Systems Engineer, IT/Presales Department.Main Duties: IT Projects that concern services provisioning as well as turnkey solutions:• Designed and implemented Cisco based networking solutions• Configured and administered company networks (LAN) and servers and provided second-tier support.• Provided design of both physical and logical network, optimizing performance and implementation strategies including rebuilding the entire network infrastructure to remote locations… Show more Job title: Systems Engineer, IT/Presales Department.Main Duties: IT Projects that concern services provisioning as well as turnkey solutions:• Designed and implemented Cisco based networking solutions• Configured and administered company networks (LAN) and servers and provided second-tier support.• Provided design of both physical and logical network, optimizing performance and implementation strategies including rebuilding the entire network infrastructure to remote locations, redesigning all Switches and Routers. • Meetings with the customers to understand their requirements and prepare proposals. • Work closely with customer at the senior technical and management levels to identify network capabilities and technical obstacles• Generate Bill of Materials for quotations. • Assist Sales department in gathering 3rd party pricing and liaising with 3rd parties, if required. • Making presentations to the customers for the final proposals• Provide after sales support to the customers after the final project deployment. Show less

Athens, Greece

Job title: Systems Engineer focusing to the promotion and after sales support for test and measurement Systems.Main Duties:• Promotion of products to public and private sector institutions. • Visits in potential customers aiming at demonstration of test & measurement systems depending on their needs. • Collaboration with the Sales Engineers providing them with a briefing on new products and technologies.• Making presentations either to potential customers or to networking… Show more Job title: Systems Engineer focusing to the promotion and after sales support for test and measurement Systems.Main Duties:• Promotion of products to public and private sector institutions. • Visits in potential customers aiming at demonstration of test & measurement systems depending on their needs. • Collaboration with the Sales Engineers providing them with a briefing on new products and technologies.• Making presentations either to potential customers or to networking events.• Familiar with the use of test and measurement systems such as cable testers, network analyzers, Protocol analyzers, bandwidth traffic shapers. Show less

Msc In Telecommunications & Computer Network Engineering, Computer Systems Networking And Telecommunications

Bachelor Of Science (Bsc), Electrical & Electronic Engineering