About
Welcome to the personal website and blog of Christoffer Vargtass Hallstensen.
Christoffer currently serves as the Cyber Threat Operations Lead for Sopra Steria AS in the Nordics.
With over 15 years of experience in cybersecurity and system administration, he has held a wide range of roles including Security Advisor, Analyst, Engineer, and Architect. He also led the Security Operations Center (SOC) at the Norwegian University of Science and Technology (NTNU) for nearly a decade.
This site is a space for sharing insights, tools, and perspectives on cybersecurity, digital forensics, threat intelligence, technology, and open source — drawing on deep, hands-on expertise and a strong commitment to knowledge sharing.