25 χρόνια IT: Ενα ταξίδι στην Τεχνολογία

Ως έμπειρος διαχειριστής συστημάτων με δυόμισι δεκαετίες εμπειρίας, έχω πλοηγηθεί στο συνεχώς μεταβαλλόμενο περιβάλλον της τεχνολογίας. Εδώ είναι μια ματιά και μερικά bytes στην επαγγελματική μου εξέλιξη

Early Foundations Link to heading

  • Custom PC Hardware Assembly: My journey began with assembling custom PC hardware, gaining a deep understanding of the intricate components that power modern computing.
  • Structured Cabling Infrastructure: I honed my skills in structured cabling installations, ensuring seamless connectivity across networks.
  • Helpdesk Support: I provided timely assistance at both the first and second levels of technical support within a financial institution.

System and Network Administration Link to heading

  • Windows and Virtual Servers: Transitioning into system and network administration, I managed physical and virtual servers predominantly in Windows environments. My responsibilities included server maintenance, performance optimization, and troubleshooting.
  • Network Configuration: I configured routers, switches, and firewalls, ensuring robust connectivity and security for the organization.
  • Leadership Roles: As my expertise grew, I stepped into leadership roles-first as a team leader, then as an IT manager-guiding teams toward operational excellence.

Sector Shift: From Finance to Energy Link to heading

Adapting to Change: The last few years witnessed a significant shift as I moved from the financial sector to the energy industry. Adapting to new challenges, I embraced the evolving landscape of IT.

  • Infrastructure Management: Currently, I provide my expertise as a Senior System and Infrastructure Engineer. My focus areas include:

    • Server Installation and Migration: Seamlessly transitioning to new servers while minimizing downtime.
    • Storage and Backup Management: Ensuring data integrity and disaster recovery across diverse platforms (Linux and Windows).
    • Virtualization and Cloud Infrastructure: Leveraging cutting-edge technologies to optimize resource utilization.
    • Data Center Operations: Overseeing capacity planning, power management, cooling efficiency, and maintaining high availability across all Data Centers and Computer Rooms.
  • Client Consultations: Beyond organizational boundaries, I advise clients on IT strategies, network design, and security best practices.

Technology Proficiency Link to heading

  1. Virtualization Platforms

    • VMware: I’ve worked extensively with VMware, including VCenter and SRM, harnessing its powerful virtualization capabilities.
    • Oracle KVM (ovirt): Managing virtual environments using Oracle KVM has been a key part of my journey.
    • OracleVM and Hyper-V: My proficiency extends to these platforms, ensuring seamless operations across diverse infrastructures.
  2. Microsoft Ecosystem

    • On-Premises and Cloud Solutions: I’ve mastered the entire spectrum of Microsoft products, from on-premises deployments to cloud services.
    • Active Directory (ADDS) and Azure AD: I’ve orchestrated AD environments, enabling secure user management and authentication.
    • Exchange Server and M365: My expertise includes configuring and maintaining Exchange environments and leveraging Microsoft 365 productivity tools.
    • Management Software: I’ve wielded tools like SCCM-WSUS (for patch management) and WAC (Windows Admin Center) to streamline operations.
  3. Linux Proficiency

    • RedHat/Oracle and Ubuntu/Debian: I’ve administered Linux servers, fine-tuning performance and ensuring robust security.
    • Web Servers, Load Balancers and WAF: My toolkit includes Apache, HAproxy and NGINX. I’ve optimized web services using load balancers and protected them with Web Application Firewalls.
    • PowerDNS and BIND: I’ve implemented and maintained DNS ininfrastructure using PowerDNS and BIND solutions, enhancing DNS reliability.
  4. Monitoring and Analytics

    • Paessler PRTG: I’ve utilized PRTG for network monitoring, ensuring proactive issue detection.
    • SolarWinds, Splunk, and Graylog: These tools have been my allies in analyzing logs, identifying trends, and troubleshooting.
    • Zabbix: I’ve configured Zabbix for comprehensive infrastructure monitoring.
  5. Database Management

    • OracleDB, MS SQL, and MySQL/MariaDB: I’ve installed, optimized, and maintained databases across different platforms.
  6. Automation and Infrastructure as Code

    • Ansible and Terraform: My recent focus lies in automation and infrastructure orchestration. Ansible streamlines configuration management, while Terraform empowers infrastructure as code.
  7. Hardware Landscape

    • Compute: I have managed servers form Cisco, DELL, IBM, HP, LENOVO, Fujitsu and Huawei.
    • Networking: I’m well-versed in Cisco Routers, Switches and PIX/ASA firewalls. Additionally, I have worked with HP/Aruba Switches.
    • Security Appliances: My familiarity extends to Watchguard and Fortigate Firewalls, as well as Barracuda Appliances.
    • Telephony: I’ve managed Alcatel PBX systems.
    • Storage Solutions: EMC, IBM, 3PAR, Fujitsu and Huawei Storages. EMC Data Domain is also part of my repertoire.
    • Tape Libraries: I’ve handled IBM, HP, and Spectra tape libraries.

Skills Link to heading

  • Problem Solver: I excel at identifying and resolving complex issues.
  • Effective Communicator: My strong communication skills facilitate collaboration within teams.
  • Independent and Team Player: I adapt seamlessly to both individual and collaborative work environments.
  • Curious and Respectful: I approach challenges with curiosity while respecting people and systems.
  • Oracle Linux System Administration I Ed 1 (Oracle University)
  • Oracle Database 19c: Administration Workshop (Oracle University)
  • CompTIA Linux+ - Cybrary.it