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Sergii has a wonderful mix of talent — both on the tech side and in communications. I very much enjoyed working with Sergii at Comodo. Companies today need his blend of capabilities, although many of them still do not know it. Sergii acted as a mediator between narrow technical specialists and our technically non-educated audience, giving Comodo a great boost in visibility, in blogs, presentations, articles, and quarterly reports that covered a wide range of malware and cybersecurity issues.

Sergii is an excellent technical content writer and presenter. His training videos are clear and presented with patience and willingness to show and help beginners and professionals on their way through difficult Cybersecurity topics.

It was quite a pleasure for me to work with Sergii A. Nesterenko. As I was responsible for development management of Anti-Spam Lab team, we were contributing to come up with blockbuster blogs and articles to help the world of IT fight against unwanted emails and similar cyber attacks. Sergii is quite professional in gathering requirements, clearing unnecessary artifacts to deliver cutting-edge technical content in the most elegant way in a timely manner. I am sure he will bring success to every bit of work he involves in.

It's been a pleasure working together with Sergii A. Nesterenko as an author for 2 courses on CyberSecurity. He has cutting edge knowledge on Cybersecurity. He is ready to deal with difficult situations and solve the problems on time and take care of the project. He was open to feedback and was capable of adapting to new working environments. Very Positive attitude towards work. Our collaboration on the course has been a real joy for me and Packt. Would love to work with him again in future and create stellar video courses on cybersecurity.

What is especially impressive when you cooperate with Sergii is his ability to deeply analyze and acutely detect the main risks and threats and quickly elaborate methods of their prevention. His huge knowledge of the most modern technologies let to solve quickly and effectively even the most complicated security tasks.

Meeting a person like Sergey who so deeply and masterly understand all aspects of information warfare and cybersecurity and able to explain the most sophisticated secrets of hidden technologies is really just a fantastic big wheel.

The distinctive feature of Sergii is that he is expert both in technical and psychological fields. This rare combination of knowledge and hands-on skills let him provide inclusive and out-of-the box effective solutions for information security issues.