15+ years keeping enterprise IT
infrastructure running.
I'm Konstantinos Sigalas — an IT professional with more than 15 years keeping enterprise infrastructure, networks and communications running. I'm part of the IT team that looks after roughly 500 users across the seven-building Viohalco Group campus in Marousi, covering Microsoft 365 support, networking, IP telephony and everyday troubleshooting.
A reliable IT professional behind the scenes.
My work sits with the infrastructure, systems and networks that large organisations lean on every day. Over the years I've moved from structured cabling and unified communications into broad enterprise IT — day-to-day support across Microsoft 365, Windows Server, VMware and Cisco networks, with hundreds of users depending on things simply working.
Right now I'm part of the IT team looking after around 500 users across seven buildings on the Viohalco Group campus in Marousi. It's a busy, multi-company environment: earlier on I was assigned to individual group companies (roughly 2.5 years each with CPW and Cenergy Holdings), and today the remit spans Steelmet, Viexal, CPW, Hellenic Cables, Fulgor, Sidenor and others on site — helping keep servers, networking and telephony stable at over 99% uptime.
I like to work methodically: confirm the symptoms, isolate the cause, apply the fix, and write it down so it doesn't come back. Behind it all is a Cisco CCNA, an MSc in Digital Communications & Networks and a lot of hands-on hours. Away from the desk, you'll usually find me somewhere off the beaten track in Greece with a drone and a camera.
Quick facts
What I work with.
A full stack of infrastructure, cloud, networking and unified-communications expertise — built to keep environments secure, available and easy to manage.
Microsoft 365 & Azure
M365 support, Exchange Online, Teams and OneDrive, plus Entra ID user administration and licensing.
Windows Server & OS
Windows Server 2016/2022, Windows 10/11, Linux and macOS in mixed enterprise environments.
Cisco Networking
Routers & switches, VoIP, WiFi, structured cabling and fiber optics (CCNA certified).
Virtualization
VMware vSphere — install, configure and manage virtual infrastructure.
Databases & Storage
MS SQL 2017–2022 fundamentals, structured cabling, fiber optics and data-centre racks.
Unified Communications
IP telephony, Asterisk, call-center platforms and MPS (uniFLOW, YSOFT).
Where I make an impact.
The areas I spend most of my time on — hands-on Microsoft 365 support, keeping infrastructure steady, and everyday troubleshooting for a busy, multi-company site.
Microsoft 365 & Identity Support
- Microsoft 365
- Exchange Online
- Entra ID (users)
- Licensing
- Teams
- OneDrive & SharePoint
Keeping day-to-day collaboration and identity services running smoothly for users across the whole campus.
Infrastructure & Daily Operations
- Windows Server
- VMware vSphere
- Networking
- Deployments
- Migrations
- IT Operations
Helping keep core servers, networking and business systems stable — part of a team that sustains over 99% uptime.
Enterprise Support & Troubleshooting
- End-User Support
- Network & VPN
- Printers & MFPs
- Windows 11
- M365 Apps
- Ticketing
First point of contact for roughly 500 users, closing around 40–60 tickets a week across several group companies on site.
Career journey.
IT Support Associate — Viohalco Group of Companies
- Six-plus years within the Viohalco Group, moving across companies as the organisation shifted — ~2.5 years with CPW, ~2.5 years with Cenergy Holdings, and now Steelmet.
- Currently the first point of contact for ~500 users across 7 buildings, covering several group companies on site — Steelmet, Viexal, CPW, Hellenic Cables, Fulgor and Sidenor.
- Day-to-day Microsoft 365 support plus Entra ID user administration, resolving ~40–60 tickets a week across laptops, MFPs, mobiles and networking.
- Help keep servers and daily operations stable, and pitch in on infrastructure projects, deployments and migrations.
Unified Communications Engineer / Consultant
- Designed, installed and parametrized UC and outbound-dialing platforms for ~54 contact/call centers serving 5,000+ agents.
- Provided technical consulting and post-installation support to enterprise clients.
Software Consultant & Product Specialist
- Monitored a fleet of ~5,500 MFPs through remote diagnostics, spotting issues before they reached the user.
- Rolled out and supported YSOFT print management (MPS), plus QNAP storage, Kodak scanners and interactive whiteboards.
Software Consultant
- Supported uniFLOW print management (MPS) for ~80 customers, plus Therefore document management for four.
- Kept watch over a fleet of ~10,000 Canon MFPs via remote diagnostics, enabling proactive maintenance and full device control.
VoIP Network Technician
- Contributed to a team project installing VoIP infrastructure at Panteion University and providing technical support.
- Built, assembled and programmed telephone exchanges using Asterisk.
IT Support — Systems & Network
- Managed backups for 15 servers using Symantec Backup Exec, plus Norton Internet Security across the organization.
- Tested, repaired and maintained information systems, networks and passive equipment; designed an IVR system (Genex).
Network Technician — Structured Wiring & Call Centers
- Assisted the team in building client networks and installing structured cabling (Cat 5e / fiber optics) for 10 client sites; trained in telephone-exchange programming.
Certifications, Degrees & Training.
39 verified qualifications — university degrees, vendor & technical certifications, cybersecurity and corporate-compliance courses, plus conferences and workshops. Click any item to open the official document.
MSc — Digital Communications & Networks
University of Piraeus · Dept. of Digital Systems · 2013
BSc — Teleinformatics & Management
TEI of Epirus · School of Management & Economics · 2008
Cisco CCNA
Routing & Switching
Microsoft Office 365 Administrator
Microsoft 365 administration
Windows 10 — Intune Device Management
Microsoft endpoint management
Cloud Management with Microsoft Endpoint Manager
Modern device & cloud management
VMware vSphere — Install, Configure, Manage
Virtual infrastructure administration
Administering a SQL Database Infrastructure
Microsoft SQL Server administration
Qlik Sense
Business intelligence & data analytics
Canon uniFLOW 5.3
Managed print services (MPS)
YSOFT Sales Foundation
Y Soft SafeQ ecosystem
YSOFT Technical Analyst
Y Soft SafeQ technical
YSOFT SafeQ 5 — Hardware Delivery
Deployment training
YSOFT SafeQ 5 — Subscription Service
Service training
Security Project 2021
Applied security project
Ethical Hacking
Audax Cybersecurity · 16h seminar
AI-Powered Hacking with ChatGPT
AI Dark Edition
Boost Productivity with AI
Ενισχύστε την παραγωγικότητα με το AI
Data-Driven Decision Making
Αξιοποιώντας τα δεδομένα στη λήψη αποφάσεων
EU NIS 2 Directive — Awareness
Regulatory / cyber compliance
Information Security Awareness — Intermediate
Corporate security training
Information Security Awareness — Foundation
Corporate security training
Information Security Awareness — Foundation II
Corporate security training
Βασικές Αρχές Ασφάλειας Πληροφοριών
Information security basics
Ethics & Code of Conduct
Corporate governance
Ethics & Code for Contact
Corporate governance
Anti-Bribery & Corruption
Corporate compliance
Employee Goal Setting
Professional development
Self Appraisal
Professional development
INFOCOM Security
Conference · information security
Green ICT 2012 + Telecoms Day
Conference · sustainable ICT
Innovation in Broadband Networks & Services
Η καινοτομία σε ευρυζωνικά δίκτυα και υπηρεσίες
Telecoms: Technology, Economy & Society
Οι τηλεπικοινωνίες μέσα από το πρίσμα της τεχνολογίας
Nanotechnology — The Science of Tomorrow
Νανοτεχνολογία… Η επιστήμη του αύριο
Radiation & the Human
Ακτινοβολίες και Άνθρωπος
Career Counselling in Multicultural Societies
Θεωρήσεις της Συμβουλευτικής για τη Σταδιοδρομία
New Technologies in Career Counselling
Η χρήση των νέων τεχνολογιών στην επαγγελματική συμβουλευτική
Preparing for the Job Market
Προετοιμασία για την αγορά εργασίας
Certificate of Attendance — 'Germanos'
Πιστοποιητικό Παρακολούθησης
Each entry links directly to the scanned certificate or diploma. Documents open in a secure view-only preview.
Let's build something reliable.
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