Prusec helps security leaders in financial services, insurance, and industry stress-test their ransomware readiness, sharpen crisis response, and build Security Operations teams that perform under pressure.
We stress-test whether your detection, containment, and response capabilities hold under real attack conditions. Starting point is a tailored tabletop exercise built around your environment, threat profile, and maturity level — surfacing the gaps that documentation doesn’t show.
Structured crisis simulations calibrated to your organisation. We test not just your playbooks, but the human factors: decision-making under pressure, escalation ownership, and cross-team coordination when it counts. These sessions frequently become the foundation for deeper engagements.
We design, build, and mature Security Operations functions that work for your organisation’s size, threat profile, and culture. Where needed, we step in as interim security lead while you hire, restructure, or recover from an incident.
The name Prusec comes from mountaineering. A prusik is a small rope with a specific knot — it moves freely under normal conditions, but holds firm under sudden load. It saves climbers from falling.
We built Prusec on that principle. Security functions that operate smoothly day-to-day need to hold firm when pressure spikes. Our work is about making sure yours does.
Mark has extensive experience in the Cyber Security field at the Finance Sector as former Executive Director leading the Security Operations Centre at UBS and being Head of the SOC in the Tier 1 Rabobank in the Netherlands. This provided him with the experience to build and run a Cyber Security Program and manage the Security Operation teams in both the technical and people-oriented sides of Cyber Security at Global Financial Enterprises.
Mark has a strong technical background in IT security before he moved into managerial roles. He has been a senior stakeholder in various security programs to protect the business against cyber security threats. Mark is very analytical and has a can do and problem-solving mindset.
Technical excellence, curiosity, and a pragmatic mindset are the key aspects that Guillaume believes are essential to strengthen an organisation’s cyber resilience.
Guillaume has gained extensive hands-on experience in offensive security, with a strong background in penetration testing and red teaming across various industries. As a CREST Registered Penetration Tester holding OSCP and OSWP certifications, he combines deep technical skill with a structured approach to assessing and improving security postures.
At Prusec, Guillaume supports our clients by identifying vulnerabilities before attackers do — translating complex technical findings into clear, actionable improvements.
a prusik knot
The name of the company finds its origin in mountaineering. Inspired by the parallel between security and mountaineering: both disciplines need a good risk management and a lot of practice.
The name Prusec is a merger between the words prusik and security. A prusik is a small rope with a specific knot. it’s used in mountaineering to provide safety to climbers.
Prusik knot is designed to move freely on a line as you climb or descent. When not put under intense force or friction, they can slide up and down with ease. If the end of the rope is pulled suddenly, the friction of the knot will create enough tension to hold the load in place. it saves a climber from falling down.
a prusik knot
the Prusec logo
The Logo of Prusec is a stylistic presentation of the knot used in the prusik rope. It will hold extreme well.
the Prusec logo
Dahliastrasse 10 8008 Zürich