Konstantinos Lianos

Cloud Security & Cybersecurity

Hello! My name is Konstantinos and I live in Athens, Greece. I'm a passionate cloud security and cybersecurity professional with more than 10 years of hands-on experience protecting people, data, and infrastructure a path that started on the IT front lines as a technician for Microsoft servers, Windows, and networks.

My focus today is cloud security and cybersecurity defending Microsoft cloud environments end to end. That means hardening identity and access across Azure and Entra ID, engineering detections in Microsoft Sentinel, and running endpoint and identity protection with Defender XDR, so threats surface early and stay contained.

I approach the work from both sides as a defender and, when it counts, thinking like an attacker: mapping how adversaries move, closing the gaps before they're exploited, and turning noisy telemetry into signal a SOC can act on. Whether it's designing a secure cloud architecture, tuning a detection, or driving incident response, the goal is the same — reduce risk and make environments genuinely harder to breach.

This blog is where I share what I learn along the way detections, teardowns, and hard-won lessons from securing the cloud, with the security community that does the same. A thank-you to the people who helped me grow, and a hand to the ones coming up next.

What I focus on

• Cloud security architecture and hardening across Microsoft Azure and Entra ID.
• Threat detection and SIEM engineering with Microsoft Sentinel KQL and connectors.
• Endpoint and identity protection with Microsoft Defender XDR.
• DevSecOps baking security into infrastructure and pipelines.
• Incident response and threat hunting.

Get in touch

Reach me at konstantinos_lianos@hotmail.com, or via the links in the footer. I'm always happy to compare notes on cloud security or talk shop about defending Microsoft environments.