With the knowledge he gained during the last 16 years of working in different IT roles he has built a very strong technical background. This has helped him to gain the skills to successfully attack systems and know how defend them.
He performed penetration testing for many clients including financial institutions, electricity companies and commercial businesses in the Netherlands, Australia and New Zealand.
Stefan his security certifications include Offensive Security Certified Professional (OSCP), EC Council Certified Ethical Hacker, EC Council Certified Forensics, EC Council Certified Security Analyst and he is an associate (Passed the CISSP exam) of the International Information System Security Certification Consortium (ISC)². With infrastructure he is Microsoft MCITP: Enterprise Administrator, Cisco CCNA and Linux LPIC-1 System Administrator certified.