Dmitry Khalansky
Senior Software Engineer at JetBrains
Munich, Bavaria, Germany
Summary
🤩
Rockstar🎓
Top SchoolDmitry Khalansky is a Senior Software Engineer based in Munich with six years of experience building language tooling and systems-level software, currently at JetBrains. He blends academic rigor—master’s-level study in computer science and a focus on type theory, formal languages, and formal verification—with practical engineering, using Haskell for prototypes and C/C++ for performance work. Dmitry contributes to notable open-source projects such as kotlinx-datetime and kotlinx.coroutines, where he implemented native Instant.now and fixed subtle concurrency bugs and tests. He prefers quiet, research-oriented long-term challenges over high-communication corporate environments and enjoys designing new formal languages as a professional hobby. Daily Linux command-line use and a background across compiler/plugins, system programming, and DevOps give him a rare mix of deep theoretical interest and hands-on platform experience.
6 years of coding experience
4 years of employment as a software developer
Computer and Information Sciences, General, Computer and Information Sciences, General at Saint-Petersburg State University Information Technologies, Mechanic and Optics (University ITMO)Master's degree, Computer Science, Master's degree, Computer Science at ITMO University
Russian, English
Github Skills (13)
kotlin10
datetime10
coroutines10
native-code10
datetimes10
semaphore10
semaphoreci10
concurrency10
test-automation10
testing10
java9
javas9
timezone8
Programming languages (6)
Github contributions (5)
Kotlin/kotlinx-datetime
Feb 2020 - Oct 2022
KotlinX multiplatform date/time library
Role in this project:
Backend Developer
Backend DeveloperContributions:7 releases, 343 reviews, 82 commits in 2 years 7 months
Contributions summary:Dmitry added stubs and build infrastructure for the native version of the kotlinx-datetime library. This involved implementing `Instant.now` using native code, indicating a focus on platform-specific implementations. The changes included modifications to core native code, specifically in `Util.kt` and `Instant.kt`, demonstrating work on date/time functionality and related utilities.
datetimedate-timekotlinxkotlintimezone
Kotlin/kotlinx.coroutines
Jul 2019 - Jan 2023
Library support for Kotlin coroutines
Role in this project:Backend Developer & QA Engineer / Test Automation Engineer
Backend Developer & QA Engineer / Test Automation EngineerContributions:16 releases, 885 reviews, 270 commits in 3 years 6 months
Contributions summary:Dmitry primarily focused on improving the codebase by fixing bugs within the semaphore implementation, specifically addressing race conditions and incorrect states. They also contributed significantly to testing, adding failing tests to expose existing issues and fixing test failures related to publication validation and JavaRX integration. Furthermore, the user worked on improving the test style, by refactoring code to use kotlin.test.* and removing Hamcrest, aligning the test framework more closely with the codebase's conventions.
kotlin-coroutineskotlin-multiplatformcoroutinessupport-librarykotlin
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