Oleg Kozliuk
Staff Software Engineer at Grafana Labs
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolOleg Kozliuk is a Staff Software Engineer based in Berlin with 11 years of experience building and optimizing large-scale distributed systems and databases. He combines deep C#/C++ systems expertise with hands-on architecture and performance work—examples include a 70% memory reduction in a 20,000-core compute platform and iterative improvements that increased RPC throughput 50x. Oleg has led cross-functional and cross-location teams at Deutsche Bank, instituted distributed decision-making practices, and now drives petabyte-scale systems and an applied AI group at Grafana Labs where he reduced TCO by 12% within months. An active open-source contributor, he has improved core efficiency and testing in projects like the Orbiter simulator and enhanced database support in the widely used Dapper .NET library. He’s known for pragmatic refactors that surface measurable gains and for mentoring engineers to scale both code and culture.
11 years of coding experience
12 years of employment as a software developer
Applied Physics and Mathematics, Applied Physics and Mathematics at Moscow Institute of Physics and Technology (State University) (MIPT)
Russian, English, German
Stackoverflow
8,797reputation
560kreached
120answers
8questions
google-chrome
top-1%
cryptography
top-5%
aes
top-5%
encryption
top-5%
Github Skills (33)
c-language10
postgresql10
testing10
dapper10
lua10
google-chrome10
optmization10
optimisation10
sql10
performance-optimization10
dotnet-core10
cprogramming-language10
csharp10
optimization10
api-design9
Programming languages (13)
Github contributions (5)
orbitersim/orbiter
Jul 2021 - Sep 2022
Open-source repository of Orbiter Space Flight Simulator
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 reviews, 34 commits, 75 PRs in 1 year 2 months
Contributions summary:Oleg primarily focused on refactoring and optimizing the codebase, specifically targeting unnecessary conversions and improving efficiency within the Orbiter Space Flight Simulator. Their work involved modifying core files like `DlgHelp.cpp`, `Help.cpp`, `Vessel.h`, `Vessel.cpp`, and `Orbiter.cpp`. Additionally, they incorporated unit tests and addressed console-related issues, ensuring the software's stability and functionality. The user also updated Lua interpreter and API calls within the project.
flightplanetsimulationastrodynamicssimulator
DapperLib/Dapper
May 2020 - Aug 2020
Dapper - a simple object mapper for .Net
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:1 review, 5 commits, 7 PRs in 3 months
Contributions summary:Oleg primarily contributed to enhancing the Dapper library's support for different database systems, specifically PostgreSQL and ClickHouse. They implemented features to support array return values and properly handle ClickHouse connections. Additionally, the user added and modified tests for PostgreSQL to ensure the correct behavior of array functionality, demonstrating a focus on thorough testing and database-specific considerations.
dotnetado-netsqlobject-mapperdapper
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