ReactiveZero is a Dutch cybersecurity consultancy based in Rotterdam. Our certified consultants test, investigate and report on the systems that matter to you, and they do the work themselves, from scoping to the final debrief.
ReactiveZero is an offensive-security consultancy in Rotterdam, the Netherlands. We examine systems the way a capable adversary would, then show you precisely what we found, how we found it and what to change.
Our consultants hold OSCP, CEH and CHFI certifications and carry out every engagement themselves. The people you meet at the scoping call are the people who do the testing and write the report.
Our work spans penetration testing, red teaming, cloud security assessments, code review, phishing campaigns, mobile application testing, digital forensics, incident response, malware analysis and bespoke projects, for organisations in finance, healthcare, critical infrastructure, government and the startup and SaaS sector across Europe.
They shape how we scope, how we test and what you receive at the end.
Every finding comes with the request, the response and the steps to reproduce it. If we cannot demonstrate it, it is not in the report.
We agree scope, windows and stop conditions before the first packet is sent, and we test live systems with the care they deserve.
Recommendations name the file, the setting or the control to change, written for the engineer who will do it, not for a slide.
One report serves the board and the build team: an executive summary in plain terms, followed by full technical detail and a prioritised list.
The consultants who scope, test and report hold recognised offensive-security and forensics certifications, and we assess against the frameworks your auditors and regulators expect.
We are glad to meet at our office, at yours or over a call, whichever suits the conversation.
Ready to strengthen your security posture? Let's discuss how we can help protect your organization.