About

Tomasz Zyśko a.k.a. CrazyRat.

Experienced Cyber Security Leader with 25+ years in penetration testing, red teaming, cyber security architecture, and team management. My career began as a Software Engineer, where I quickly advanced to leadership roles driven by strategic thinking, technical expertise, and a passion for motivating teams.

I have demonstrated success across diverse sectors including FinTech, insurance, and the cryptocurrency industry. My experience spans conducting advanced red team operations for organizations with over 150,000 endpoints, executing penetration tests on critical IT/OT infrastructures, and building security teams from the ground up to self-sufficiency. I am adept at both identifying vulnerabilities and driving robust remediation, shaping secure IT environments according to risk and business strategy.

My leadership approach emphasizes knowledge sharing, coaching, and empowering teams to reach their highest potential. I am skilled at collaborating with development and business stakeholders to integrate security best practices and foster a culture of security awareness. In addition to hands-on technical work, I provide vCISO consultancy services, advising organizations on building resilient cybersecurity programs tailored to business needs.

If you want to quickly get the overview of my confirmed experience check out this awesome cybersecurity certification roadmap on which I've marked certifications I own.

My progress in learning of Microsoft/Azure stack is visible here.

In addition, you can check how am I doing at Hack The Box and Pentester lab platforms.