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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.

Sergii Nesterenko has a rare combination of deep knowledge and hands-on experience in various cybersecurity domains and strong influential writing. This special feature is high-demanded nowadays when educating cybersecurity topics and promoting cybersecurity products have become a priority task. His mastery in turning technical cybersecurity topics in engaging articles, blog entries and other kinds of influential writing have enabled effective informing wide audience about Comodo’s team achievements in its struggle against cybercrimes. Sergii’s ability to transform hard-to-understand cybersecurity topics into capturing stories for the wide audience is a wonderful way to deliver value information and win the hearts and minds of the customers.
Add here excellent communication skills to work effectively in the multinational command -- and you’ll understand why I’m sure that Sergii will add a great value to any company that invites him onboard.

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.

В работе с Сергеем особенно впечатляет его способность глубоко анализировать и точно определять главные риски и оперативно предлагать методики их предотвращения. Его обширные знания в сфере самых современных технологий позволяют быстро, эффективно и главное – без больших затрат – решать очень сложные, иногда поначалу кажущиеся неразрешимыми задачи.

Встретить человека, который так глубоко и виртуозно разбирается во всех аспектах информационных войн и способен просто и доступно объяснить сложнейшие секреты информационных технологий – не просто удача, а бесценный подарок!