Vsevolod Tolstopyatov
Kotlin Project Lead at JetBrains
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolVsevolod Tolstopyatov is a Kotlin project lead at JetBrains with 11 years of experience building high-performance, JVM-focused systems and leading core language and library efforts. He combines deep interest in JVM internals, concurrency and mechanical sympathy with hands-on work—contributing performance-sensitive code to Kotlin, kotlinx.coroutines, Ktor and JCTools (implementing lock-free and wait-free counters). At JetBrains he progressed from engineer to leading the Kotlin ecosystem and now guides the language project itself, helping stabilize features and optimize runtimes. He’s noted for improving exception handling, serialization and low-level I/O robustness, and for pragmatic benchmarking that informs library design. Based in Amsterdam with a mathematics and computer science background from Saint Petersburg State University, he brings both formal rigor and low-level systems taste to large-scale developer tools.
11 years of coding experience
10 years of employment as a software developer
Bachelor's degree Mathematics and Computer Science, Bachelor's degree Mathematics and Computer Science at Saint Petersburg State UniversityComputer Science CenterSaint Petersburg Lyceum 239
Русский, English
Github Skills (47)
asynchronous10
kotlin10
unit-testing10
code-optimization10
benchmark10
netty10
multithreading10
async10
data-serialization10
data-structure10
mio10
java10
serialization10
javas10
compiler-compiler10
Programming languages (10)
Github contributions (5)
Kotlin/kotlinx-io
May 2018 - Dec 2022
Kotlin multiplatform I/O library
Role in this project:
Backend Developer
Backend DeveloperContributions:58 reviews, 44 commits, 47 PRs in 4 years 7 months
Contributions summary:Vsevolod primarily focused on improving the Kotlin multiplatform I/O library, specifically within the native charset component. They addressed potential vulnerabilities by ignoring malformed inputs and buffer overflows in native charsets. The user introduced error checking, ensuring the robustness of the character encoding and decoding operations. They also updated dependencies, particularly kotlinx.coroutines, to a release candidate version.
kotlin-multiplatformkotlinxkotlinkotlin-librarymultiplatform
Kotlin/kotlinx.coroutines
Mar 2018 - Jan 2023
Library support for Kotlin coroutines
Role in this project:Back-end Developer
Back-end DeveloperContributions:44 releases, 1069 reviews, 1058 commits in 4 years 11 months
Contributions summary:Vsevolod's commits primarily focus on improving the kotlinx-coroutines library's exception handling and stacktrace recovery mechanisms. The user implemented features like copying exceptions, handling issues related to thread local variables, and ensuring the integrity of exception messages. They also contributed to the code that handles multi-threaded dispatchers to improve the liveness of the system.
kotlin-coroutineskotlin-multiplatformcoroutinessupport-librarykotlin
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