S
Sergey Polyashov
About
Detail
Chief Operating Officer
Serbia
Résumé
Jobs
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Chief Operating OfficerTolokaNov 2025 - Current (1 year)- Principal Software Engineering ManagerMicrosoftNov 2022 - Nov 2025 (3 years 1 month)
- Head of Department of ML and Analytics (E-commerce)YandexApr 2021 - Feb 2023 (1 year 11 months)• Founded and launched Yandex.Shopping, the first retail-integrated search vertical in Russia — a platform comparable to Google Shopping, but tailored to local markets with richer data integration.
• Hired and built multiple teams from scratch, creating a full department responsible for ML, Search Quality, Recommendations, UGC/Reviews, Runtime, Infrastructure, and Product Features.
• Designed large-scale ML pipelines and recommender systems, seamlessly blending organic search, ads, and user-generated reviews to maximize relevance and personalization.
• Built a new analytics platform from the ground up, enabling continuous optimizat - Head of Video RecSys & Video PlatformYandexSep 2018 - Apr 2021 (2 years 8 months)• Designed and launched the Yandex Video Platform, a large-scale system where machine learning–driven recommendations formed the core. The platform combined hosting, streaming, and recommendation technologies into a unified ecosystem.
• Created a personalized recommender system from scratch, capable of adapting to user actions in real time and generating item-to-item suggestions — becoming one of the most accurate and engaging recommendation engines at Yandex.
• Achieved 3.5× growth in video streaming traffic by continuously improving offline and online metrics, experimenting with models, and optimizing for user satisfaction.
• Led multiple teams (30+ engineers) dedicated to recommender quality, runtime, and CMS, ensuring rec - Head of Video Search & Recommender ServiceYandexFeb 2013 - Sep 2018 (5 years 8 months)• Directed 3 specialized teams (15+ engineers) across search quality, recommendation quality, and runtime performance, building Yandex’s next-generation video search experience.
• Designed and deployed a state-of-the-art ML-powered video search system, leveraging feature engineering and iterative optimization to deliver +5% relevance gains every six months in both offline and online metrics.
• Created a scalable item-to-item recommendation pipeline, significantly improving personalization, user engagement, and watch-time.
• Ensured high availability and performance of video search infrastructure, orchestrating thousands of servers running 24/7 on Linux cloud systems with robust monitoring and fault tolerance. - Principal Software EngineerKaspersky LabJan 2012 - Jan 2013 (1 year 1 month)Built core modules for Kaspersky Internet Security and Anti-Virus, led advanced debugging and dump analysis, and delivered performance optimizations that made protection faster and more reliable.
- Software Engineering ManagerAcronisJun 2008 - Jan 2012 (3 years 8 months)• Managed a team of 5-10 engineers, fostering a collaborative environment to drive project success.
• Spearheaded research and development for data synchronization technologies, enhancing product reliability.
• Developed algorithms for data synchronization, contributing to the success of Acronis Online Backup and Acronis True Image Home. - PSoftware EngineerPriboyMar 2007 - Jun 2008 (1 year 4 months)Built sonar-based hydroacoustic systems for submarine detection
Education
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- Master of Business Administration - MBA, Information TechnologyThe Russian Presidential Academy of National Economy and Public Administration RANEPASep 2019 - Oct 2021 (2 years 2 months)
- TMaster's degree, EngineeringTaganrog Institute of Technology Southern Federal UniversitySep 2002 - Jul 2007 (4 years 11 months)