# Antonis Mortos Antonis Mortos is a remote worker on Himalayas, Senior Linux IT / Systems Administrator at 13CS Systems Integrators, based in Greece. Source: https://himalayas.app/@antonismortos ```text I modernize mission-critical Linux, Kubernetes, and high-availability infrastructure for resilient enterprise services. ``` | Detail | Value | | --- | --- | | Availability | Looking for a job | | Location | Greece | | Authorized to work in | Greece | | Salary expectations | 40k+ EUR | | Job categories | Linux Systems Administrator, Infrastructure Engineer, Kubernetes Administrator, Network Engineer, Cybersecurity Engineer, Telecommunications Engineer, Project Manager | | Skills | Linux Administrator, Debian, Ubuntu, Red Hat Enterprise Linux, OpenShift, Kubernetes, Containerized Technologies, BASH, Infrastructure Automation, HAProxy, High Availability, Load Balancing, Virtualization, Proxmox VE, VMWare, Networking, Network Infrastructure, Network Administration, LAN, WAN, DNS, Web Services, Reverse Proxy, Firewalls, VPN, System Hardening, Storage Management, SAN, NAS, Monitoring, Zabbix, Prometheus, Troubleshooting, Production Support, Disaster Recovery, Backup, Backup Exec, Veeam Backup and Replication, IT Security, Cybersecurity, Windows Server, Active Directory, Azure, SCADA, SIP, VoIP, Asterisk, Telecommunications, IP Communication, Cisco Networking, Cisco Unified Communications Manager (CUCM), Juniper, TETRA, SAMBA, SQUID Proxy Server, Zimbra Mail Server, Open Xchange, Technical Support, Incident Management, Jira Service Desk, Technical Documentation, Project Management | | LinkedIn | https://www.linkedin.com/in/antonios-mortos | | GitHub | https://https://github.com/antonismor | ## What I'm looking for ```text I'm looking to modernize and operate mission-critical Linux, Kubernetes, high-availability, networking, and cybersecurity infrastructure, with ownership of resilient production services and complex incident resolution. ``` ## About ```text I am a Senior Linux and Infrastructure Administrator with extensive experience in enterprise IT environments, systems administration, virtualization, networking, cybersecurity and automation. My background includes Linux and Windows Server administration, Active Directory, Kubernetes, OpenShift, Proxmox, VMware, Hyper-V, Azure, Microsoft 365, HAProxy, VPN technologies, SQL environments and Bash/Python automation. I have worked on large-scale infrastructure projects, including the migration of more than 100 systems and services to Linux and Kubernetes environments, high-availability platforms, SCADA infrastructure, network and security projects, and enterprise server environments. I have hands-on experience troubleshooting complex production issues, designing resilient infrastructure, managing virtualization clusters, implementing secure remote access solutions and automating repetitive administration tasks. Cybersecurity is also an important part of my professional background. I hold certifications including CISSP, CISM, CISA, Security+, CEH Practical, GIAC GSEC, SSCP and CASP, which complement my practical infrastructure and systems experience. I am particularly interested in Senior Linux Administrator, Kubernetes Administrator, Infrastructure Engineer, Systems Engineer, Platform Engineer and DevOps-oriented roles. I enjoy working with Linux, Kubernetes, automation, high availability, networking, security and modern infrastructure technologies. I am currently looking primarily for fully remote opportunities where I can contribute both technically and operationally to complex IT environments. ``` ## Experience ### Senior Linux IT / Systems Administrator 13CS Systems Integrators. Oct 2025 - Feb 2026 ```text 13CS Systems Integrators | October 2025 - February 2026 Held a key technical role in the migration of Greece's 112 Emergency Communications Service from legacy Microsoft Windows Server 2008 infrastructure to a modern Kubernetes-based Linux services architecture. Responsible for the migration, deployment, administration, and operational support of Linux-based services running within Kubernetes e ``` Skills: Linux-Administrator, Kubernetes, BASH, Infrastructure-Automation, HAProxy, High-Availability, Load-Balancing, Containerized-Technologies, Troubleshooting, Production-Support ### Information Technology System Administrator Byte Computer S.A.. Jun 2024 - Oct 2024 ```text Managed, monitored, and maintained the company's IT infrastructure, including servers, network devices, and workstations. Administered and supported enterprise server environments. Provided technical support to end users, ensuring uninterrupted operation of hardware and software systems. Implemented security policies and performed system updates, backups, and access-control management. Con ``` Skills: System-Administration, IT-Infrastructure-Operations, Server-Administration, Networking, Network-Troubleshooting, Firewalls, Routers, Network-Switches, Backup-Exec, Veeam-Backup-and-Replication, Backup, Data-Backup-Solutions, IT-Security-Support ### Information Technology System Administrator Byte S.A. - Galatsi, Greece. Jun 2024 - Oct 2024 ```text Managed, monitored, and maintained the company's IT infrastructure, including servers, network devices, and workstations. Administered and supported enterprise server environments. Provided technical support to end users, ensuring uninterrupted operation of hardware and software systems. Implemented security policies and performed system updates, backups, and access-control management. Configured ``` ### Linux Senior Systems Administrator Constrat Ltd. & G.K.G. Innovations. Dec 2022 - Feb 2024 ```text Participated in SCADA automation and infrastructure projects for EYDAP - Athens Water Supply and Sewerage Company, through GlobalGR. Designed, administered, and supported high-availability virtualized infrastructure based on Proxmox VE HA clusters for business-critical industrial and monitoring environments. Deployed and operated Kubernetes clusters on Proxmox VE High Availability infrastructu ``` Skills: Proxmox-VE, Kubernetes, WinCC-SCADA, VPN-Wireshark, Infrastructure-Automation, Monitoring-Zabbix-Prometheus, VPN-SLA-Monitoring ### Technical Field Engineer Euroaxes S.A.. Jan 2022 - Nov 2022 ```text Installed and maintained copper-based telecommunications infrastructure for residential customers. Deployed vertical cabling systems. Installed and supported telecommunications services for Cosmote and Wind customers. Performed field troubleshooting, diagnostics, and installation support activities. ``` Skills: Telecommunications, Field-Service-Engineering, Troubleshooting, Technical-Support, Network-Installations ### Information Technology Support Engineer Vodafone Greece. Feb 2012 - Apr 2019 ```text Employment was primarily through fixed-term monthly or quarterly contracts with organizations including ICAP, Adecco, Randstad, Telecroft, and Teleperformance. Managed and resolved technical incidents and service requests for major enterprise customers. Diagnosed and troubleshot LAN, WAN, networking, and telecommunications infrastructure issues. Used advanced monitoring and troubleshooting tools t ``` ### Level 2 IT Support Engineer Vodafone Greece. Feb 2012 - Apr 2019 ```text Managed and resolved technical incidents and service requests for major enterprise customers. Diagnosed and troubleshot LAN, WAN, networking, and telecommunications infrastructure issues. Used advanced monitoring and troubleshooting tools to identify and resolve complex technical problems. Coordinated with internal technical teams and external partners for incident resolution. Worked within st ``` Skills: Technical-Support, Incident-Management, Jira-Service-Desk, LAN, WAN, Networking, Telecommunications, Troubleshooting, Technical-Documentation, Customer-Support, Enterprise-Networking ### Networking Field Engineer Comtel MFC. Jan 2009 - Dec 2011 ```text Worked as a Field Engineer on enterprise telecommunications and IP communications projects. Participated in international technical deployments, including projects in Iraq. Supported complex distributed communications infrastructure. Worked with SIP-based communications technologies. Deployed and supported Asterisk PBX systems. Provided installation, configuration, troubleshooting, and o ``` Skills: Field-Service-Engineering, Telecommunications, IP-Communication, Asterisk, Installation, Configuration, Technical-Support, Communications-Infrastructure ### Founder & Telecommunications Consultant AM Telecoms. Aug 2005 - Sep 2009 ```text Provided consulting, installation, administration, and technical support services for Asterisk PBX solutions. Installed and configured Windows Server-based network infrastructures. Designed and implemented Samba Domain Controller environments on Debian Linux platforms. Administered Linux-based server and network infrastructure. Delivered networking and systems-integration services for smal ``` Skills: Asterisk, SAMBA, Samba-Active-Directory-Roaming-Profiles, Open-Xchange, Zimbra-Mail-Server, Linux-Administrator, SQUID-Proxy-Server, Security-Systems-Integration, Telecommunications, Troubleshooting ### Project Manager / Telecommunications Engineer [Siemens](https://himalayas.app/companies/siemens). Oct 2002 - Sep 2004 ```text Monitored and administered server and network infrastructures, including Cisco and Juniper environments. Configured Cisco networking equipment for Dial-Up and ADSL-based applications. Supported industrial controllers and remote communication systems. Participated in the deployment of a Network Operations Center (NOC) consisting of four 42U racks hosting servers and network equipment. Parti ``` Skills: Project-Management, Telecommunications, Troubleshooting, Cisco-Networking, Cisco-Unified-Communications-Manager-(CUCM), Juniper-Products, Network-Administration-TETRA, Infrastructure-Deployment, Network-Infrastructure, Technical-Support ## Education ### Brunel University of London Computer Science ```text IT User Support: Provided technical support to students, academic staff, and visitors, ensuring the smooth operation of IT systems and services. Infrastructure Management: Installation, maintenance, monitoring, and administration of hardware and software infrastructure. Information Security: Applied information-security principles and best practices to support data protection and regulatory compli ``` ### Brunel University of London Computer Science & Information Technology ```text IT User Support: Provided technical support to students, academic staff, and visitors, ensuring the smooth operation of IT systems and services. Infrastructure Management: Installation, maintenance, monitoring, and administration of hardware and software infrastructure. Information Security: Applied information-security principles and best practices to support data protection and regulatory comp ``` ### Cisco Networking Academy Cisco Certified Network Associate Routing and Switching (CCNA) ### Cisco Networking Academy Cisco Certified Network Professional (CCNP) ### Cisco Networking Academy Cisco Certified Internetwork Expert Security (CCIE-S) ### Cisco Networking Academy Cisco CCVP ### Cisco Networking Academy Cisco Certified Design Associate (CCDA) ### Microsoft Microsoft 365 Certified: Fundamentals ### Microsoft Microsoft Certified: Azure Fundamentals ### Microsoft Microsoft Certified: Azure AI Engineer Associate ### ISC2 Certified Information Systems Security Professional (CISSP) ### ISACA Certified Information Systems Auditor (CISA) ### CompTIA CompTIA Security+ (SY0-701) ### EC-Council Certified Ethical Hacker (CEH Practical) ### ISACA Certified Information Security Manager (CISM) ### GIAC Certifications GIAC Security Essentials (GSEC) ### ISC2 Systems Security Certified Practitioner (SSCP) ### CompTIA CompTIA Advanced Security Practitioner (CASP) ### GIAC Certifications GIAC Certified Incident Handler (GCIH) ## Tech stack - Microsoft Azure - Kubernetes - Veeam Backup & Replication - Jira Service Desk - HAProxy - Prometheus - Zabbix - Ubuntu - Debian - Red Hat Enterprise Linux - Windows Server - Red Hat OpenShift - Proxmox VE - Juniper - Bash - Asterisk To contact Antonis, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire). ## People also viewed - [George Tseres](https://himalayas.app/@georgetseres): Lead Site Reliability Engineer, PacketFabric - [Dimitris Giatsios](https://himalayas.app/@dimitrisgiatsios): Teaching Assistant, University of Thessaly - [Dimitri Economou](https://himalayas.app/@dimitrieconomou): Cloud Engineer \[Sr.Network DevOps\], Oracle NetSuite - [Spiros Mouzakitis](https://himalayas.app/@spirosmouzakitis): Infrastructure Specialist, Kyndryl - [Dimitris Zervas](https://himalayas.app/@dimitriszervas): Senior DevOps Engineer, Plasma - [Konstantinos Boviatsis](https://himalayas.app/@konstantinosboviatsi): Head of Support, IT & OT Solutions Company - [Manos Aggeladas](https://himalayas.app/@manosaggeladas): Senior ICT Engineer, Solidity Technology - [Theodore Skoultsos](https://himalayas.app/@theodoreskoultsos): Independent IT Specialist / Systems Administrator, Independent - [Αριστείδης Καρκανέβατος](https://himalayas.app/@0006555): Azure Cloud Engineer, ABS Wavesight - [fotis mpouraimis](https://himalayas.app/@fotismpouraimis): DevOps Engineer / Sys Admin, Cadence Design Systems