Denis Protivensky is a professional in their field. Colleagues describe them as "Denis has always been reliable and easy to work with. At Percona we worked together on some projects related to speaking at events, and Denis always agreed to help the team whenever he could, explain deeply technical stuff and give talks within his area of competence. Denis proved to be both an excellent solo expert and a great team player, helping his colleagues out and keeping friendly terms in the group. " and "Denis is a great leader. He managed to build a strong team with excellent engineering culture even though at the beginning most of the members of the team were fresh grads and had very little experience in industrial programming. As an engineer, he contributed the most complex parts of the project and provided advice and help to other team member when they needed it. "