“I had the pleasure of managing Kostiantyn at EPAM, and my experience working with him has been entirely positive. He consistently fulfilled all responsibilities assigned to him with a high level of quality and professionalism. Kostiantyn provided thoughtful feedback both on project matters and during the technical interviews he conducted. He is always positive, focused, and approachable, with a strong ability to learn new technologies quickly while maintaining a broad technical expertise. Throughout our collaboration, there was not a single instance where he missed a deadline — if he committed to completing something by the end of the day, that's exactly when it was done. I can wholeheartedly recommend Kostiantyn as an excellent developer, colleague, and team player.”

Manager21 yrs exp

Preeti IndulkarManaging ConsultantNow: Managing Consultant at EPAM/First DerivativePreeti managed Kostiantyn directly at EPAM · EPAM/First Derivative, 2024–2026

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“I conducted an internal interview with Konstantin for a project, and he left a very positive impression. He comes across as a knowledgeable specialist with a solid technical background and a deep understanding of software development. At the same time, he's an open and friendly person with extensive hands-on experience and a broad view of modern technologies. The conversation flowed naturally, and we were on the same wavelength throughout. I'd be glad to have an opportunity to work with him on a project in the future.”

Colleague8 yrs exp

Manoj SharmaFrontend Engineering LeadNow: Frontend Engineering Lead at EPAMKostiantyn interviewed Manoj as a React/JS expert at EPAM · EPAM, 2025

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“I had the great pleasure of working with Konstantin Keylin in the same company, and I can confidently say that he is an outstanding professional and an exceptional colleague. Konstantin combines deep technical expertise with an impressive ability to solve complex problems quickly and efficiently. What sets him apart is not only his knowledge, but also his positive attitude, reliability, and willingness to help others. He consistently earned respect and trust from everyone around him – both managers and teammates – because of his professionalism and strong work ethic. Whenever a challenging task appeared, Konstantin was the one people relied on to handle it with confidence and precision. His proactive mindset, clear communication, and ability to see the bigger picture made him a key contributor to our success. On top of that, he is a genuinely great person to work with – approachable, collaborative, and always bringing positive energy to the team. I can wholeheartedly recommend Konstantin as a top-level expert and an invaluable team player. Any company would be lucky to have him. ”

Colleague

Pavlo VynohradovHead of Unity XR Department / Team LeadNow: Software Engineer at SportradarPavlo worked with Kostiantyn on different teams · Litslink, 2018–2020

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