Sergey Saiyan
VP, Product And Engineering Search, Ads, RecSys, ML Infra at OZON.ru
Tbilisi, Georgia
Summary
👤
Senior🎓
Top SchoolSergey Saiyan is a seasoned technology leader with 12 years of experience advancing search, ads, recommender systems and ML infrastructure, currently serving as VP of Product and Engineering at OZON.ru. He combines hands-on backend engineering roots—contributing to open-source projects like CUBA Platform—with strategic product leadership that delivered major launches such as a custom O2 Lucene-based search engine, CPM ads, and personalized ML ranking. Sergey has repeatedly scaled teams and systems (growing an org from ~16 to ~80 engineers and leading ~15 teams), while cutting latency and improving throughput through pragmatic architectural changes. He blends product management with technical ownership, founding OZON’s ML Infra and steering search product strategy since 2023. Notably, his work often pairs algorithmic improvements (DSSM, gradient boosting, ALS) with infra optimizations that yielded measurable business impact, like double-digit ad revenue growth and large conversion gains. Based in Tbilisi, Sergey brings a practical, metrics-driven approach to shipping complex distributed systems at scale.
12 years of coding experience
10 years of employment as a software developer
Specialist Automated Systems for Data and Processes Management, Specialist Automated Systems for Data and Processes Management at Samara State Aerospace University
English, Russian, Georgian
Stackoverflow
11,508reputation
1.2mreached
248answers
49questions
gradle
top-5%
java
top-1%
generics
top-5%
parallel-processing
top-5%
concurrency
top-5%
multithreading
top-5%
Github Skills (22)
business-application10
schema-design10
java10
javas10
sql10
db-schema10
cuba-platform10
database-schema10
schema10
application10
hadoop9
multithreading9
gradle9
parallel-processing9
concurrency9
Programming languages (3)
Github contributions (5)
cuba-platform/cuba
Aug 2013 - May 2015
CUBA Platform is a high level framework for enterprise applications development
Role in this project:
Backend Developer
Backend DeveloperContributions:36 commits, 7 comments in 1 year 9 months
Contributions summary:Sergey primarily contributed to bug fixes and enhancements within the CUBA Platform, focusing on database update scripts and core backend logic. Their work involved modifying SQL scripts for database schema updates, addressing typos, and integrating code related to email functionality and exception handling. They also worked on aspects related to the framework's entity logging and attribute editor components.
apache2-licensefull-stackhigh-levelradframework
AdamSkywalker/ray
May 2015 - Oct 2017
Contributions:33 commits, 30 pushes, 2 branches in 2 years 5 months
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