Sergey Kleyman
Principal Software Engineer at Elastic
Israel
Summary
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RockstarSergey Kleyman is a Principal Software Engineer based in Israel with seven years of focused experience delivering reliable back-end systems and developer tooling. Currently at Elastic since 2019, he drives maintainability and performance improvements in production-grade open-source telemetry code. Previously a senior engineer at BMC, he brings a decade-plus background in enterprise software engineering and pragmatic refactoring. His open-source contributions include implementing a reusable ToStringBuilder and refactoring core tracing types in the widely used elastic/apm-agent-dotnet, reflecting attention to consistent diagnostics and measurable performance gains. Colleagues rely on him for clean, test-driven enhancements that reduce technical debt and improve observability. He blends deep C# ecosystem knowledge with an engineer’s focus on clarity, testability and efficient runtime behavior.
7 years of coding experience
8 years of employment as a software developer
Github Skills (15)
refactoring10
csharp10
dotnet-core10
refactor10
netframework10
logging9
unit-testing9
performance-optimization8
performance-analysis7
trace7
error-log7
tracer7
performance-monitoring7
apm7
error-detection7
Programming languages (12)
Github contributions (5)
elastic/apm-agent-dotnet
Mar 2019 - Aug 2020
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 105 commits, 152 PRs in 1 year 5 months
Contributions summary:Sergey implemented a helper class, `ToStringBuilder`, for creating a consistent `ToString` format across the codebase. This included writing tests to ensure its functionality. The user then refactored multiple classes (`Transaction`, `Span`, and `Error`) within the project to utilize the new helper, indicating a focus on code maintainability and consistent logging/debugging outputs. The user also made several optimizations and code improvements to the helper class and its usages, improving performance.
performance-monitoringperformance-analysisapmagentelastic
SergeyKleyman/opbeans-php
Jan 2021 - May 2023
PHP backend implementation for Opbeans, Elastic APM demo app
Contributions:1 PR, 41 pushes, 21 branches in 2 years 4 months
demo-appphp-backendapmelasticphp
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