We deliver Incident Response,
Detection Engineering,
Threat Hunting and Hardening services.

See our services Cyber Range PurpleLabs


We perfectly understand that you need more than a single security solution to protect your company from cyber crime. With Defensive Security, you just know that we cover most of your cyber security needs - from consulting, advanced solutions and implementations to educational services. Our powerful knowledge meets your strategic, operational and tactical needs, from low-level OS internals, through SOC activities ending up on highly secure web and cloud solutions.

Our clients include

When it comes to avoiding the security problems, it is necessary being not only security-aware but smarter than attackes as well. Leszek, for sure appears to be the one to comply both criteria - he is the smartest and the most alert man of Linux security I have ever met. He creates environments having very important principle always in mind: "Secure by design".
He is an expert in security and training, who possesses wide knowledge and a lot of experience. I highly recommend Leszek Miś. May the Force be with you!

Przemysław Tarnawski Alior Bank