I am a Hellenic Army Signals Officer (Captain) and cyber-security professional with nearly three decades of technology, operational and command service. More than 13 years of my career have been in NATO units, an agency and multinational headquarters, working across operational CIS, NOC/SOC environments, INFOSEC, COMSEC, cyber defence and CTI.

I hold a BSc in Informatics from the Hellenic Open University. My thesis examined AI-assisted cyber threat detection using Knowledge Graphs, MITRE ATT&CK, NIST CSF 2.0, Neo4j and related analytical methods.

• At the NATO CIS Control Centre in Naples, I monitored geographically distributed communications services and managed REMEDY/ITSM incidents from initial report through troubleshooting, coordination, resolution, closure and shift handover.
• At NRDC-GR, I progressed from Crypto Custodian and INFOSEC duties to Cyber and CIS Security Staff Officer and Chief of the Cyber and CIS Security Cell. I designed and established the foundations of the headquarters' dedicated Cyber Defence and CIS Security Cell, including its structure, manning, job descriptions, qualification requirements and training pathways.
• I contributed to more than 20 NATO and national exercises, readiness evaluations and command-post activities across TOC, NOC, SOC and JOC environments. This included FMN Spiral 2 change-management work and team participation in CIS evaluation activity covering more than 8,000 test and assessment indicators.
• I have commanded a communications company and an independent CIS platoon, combining personnel leadership with communications-centre, CIS-security and COMSEC responsibilities.
• I currently serve as a Staff Officer for Host Nation Support and RSOM within GRC RSOM & SPT HQ under JLSG Naples. In this headquarters title, GRC is the NATO country code for Greece.

My public work connects operational cyber experience with practical, explainable security engineering. I use public or synthetic data and keep employer systems, operational detail and sensitive material outside these repositories.

• Python tools for security review and evidence handling
• NIST CSF and SP 800-53 control and outcome mapping
• MITRE ATT&CK, D3FEND and structured CTI analysis
• Neo4j, Cypher, Knowledge Graphs and graph-based threat modelling
• Security governance, incident handling and operational resilience

The Ledger tools are small, local-first instruments. Each one records a decision and the evidence behind it, rather than reducing it to a score.

Cyber Operations    NOC/SOC / CTI / incident handling / REMEDY-ITSM / monitoring
Security            Cyber defence / INFOSEC / CIS Security / COMSEC / resilience
Frameworks          MITRE ATT&CK / NIST CSF / D3FEND / NIST SP 800-53
Graph Technologies  Neo4j / Cypher / Knowledge Graphs / GraphRAG concepts
Programming         Python / JavaScript / HTML / CSS
Web                 WordPress / web design / HTTP security review
Leadership          Company and platoon command / NATO staff work / FMN coordination

All repositories in this profile are independent portfolio and educational projects.

They are not affiliated with, endorsed by, or connected to NATO, the European Union, the Hellenic Army, or any current or former employer. Public repositories use only public, synthetic, demo or intentionally sanitised data. No classified, restricted, internal operational or sensitive COMSEC-related information is published here.

• LinkedIn: linkedin.com/in/vasilios-tsalikidis-0b567ab2
• GitHub: github.com/v-k-tsalikidis