Alexey Ozeritskiy
Software Engineer at Citadel Securities
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolAlexey Ozeritskiy is a software engineer with 16 years of experience building high-performance distributed systems and databases, currently working on autocallables pricing at Citadel Securities in London. He holds a PhD in computational mathematics from Moscow State University and has repeatedly improved large-scale data platforms—most notably delivering up to 100x speedups in a distributed streaming SQL engine and up to 10x latency reductions on TPCH workloads for YDB. His background spans low-level systems (embedded firmware, custom I/O engines) to distributed data infrastructure (LogBroker, YT, YDB) and HFT core integrations, showing rare full-stack maturity across performance-critical domains. An active open-source contributor, he has contributed backend core logic to the YDB distributed SQL database, focusing on serialization, task runners, and ACID-consistent features. He also has hands-on experience improving and patching upstream components like Kafka and integrating UDP multicast for low-latency feeds, reflecting both operational and research-driven problem solving. Colleagues rely on him for deep algorithmic insight paired with practical engineering that scales to thousands of nodes.
16 years of coding experience
16 years of employment as a software developer
Lomonosov Moscow State University
English
Stackoverflow
11reputation
0reached
1answer
0questions
Github Skills (18)
c-language10
back-end-development10
databases10
distributed-systems10
sql10
dbm10
cpp10
cprogramming-language10
distribute10
distributed-database10
relational-databases10
dbms10
sql-database10
database10
vulkan6
Programming languages (4)
Github contributions (5)
ydb-platform/ydb
May 2022 - Jul 2022
YDB is an open source Distributed SQL Database that combines high availability and scalability with strong consistency and ACID transactions
Role in this project:
Back-end Developer
Back-end DeveloperContributions:272 reviews, 22 commits, 297 PRs in 1 month
Contributions summary:Alexey contributed to the YDB database by implementing and modifying backend features related to SQL database functionalities. The commits involved adding allowed groups, implementing task runner actors, and enhancing CA execution modes. Their work focused on areas such as data serialization, and handling internal errors. The code changes demonstrate involvement in the database engine's core logic.
dbmsdistributed-sql-databaseydbdatabaseconsistency
resetius/miniraft-cpp
Nov 2023 - Mar 2025
Raft Consensus Algorithm. Uses in-house C++20 coroutines-based library for communications. Tested with unit-tests.
Contributions:39 PRs, 234 pushes, 32 branches in 1 year 4 months
coroutinescppcpp20raftraft-consensus-algorithm
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