google/kotlin
May 2025 – Sep 2025
4 Months active
Languages Used
KotlinJava
Technical Skills
API DesignBuild ToolsCode CleanupCompiler APIIncremental CompilationRefactoring
Evgenii Mazhukin
PROFILE
Evgenii Mazhukin
Worked on the google/kotlin repository to enhance incremental compilation and build tooling for Kotlin projects. Focused on improving performance and reliability by refining the IncrementalCache API, optimizing ABI hash computation to ignore non-ABI debug-info changes, and expanding test coverage for inline property accessors in value classes. Developed a reusable multiproject test scenario to simulate real-world incremental build behavior across modules, enabling faster diagnosis of build-tool issues. Used Kotlin and Java extensively, applying skills in compiler internals, build systems, and testing. The work emphasized code cleanup, targeted refactoring, and careful restoration of essential APIs to maintain robust incremental compilation workflows.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
7Total
Bugs
2
Commits
7
Features
5
Lines of code
852
Activity Months4
Your Network
820 peopleSame Organization
@jetbrains.com671
Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025Month: 2025-09 — Google Kotlin repository (google/kotlin) contributed a focused feature to improve incremental build testing in a multi-module setup. Delivered an incremental multiproject test scenario for Build Tool API (BTA) tests, including Kotlin source files and a dedicated test class, designed to simulate a realistic multiproject project structure for incremental compilation testing. This work establishes a repeatable test environment to debug incremental build scenarios in multiproject configurations, enabling faster diagnosis of build-tool related issues and higher confidence in incremental compilation behavior across modules. Commit reference: cae074705afec9643b6b14cc5ae2179eafcaf003 with message "[Test] Add incremental multiproject to BTA tests"
1 Commits • 1 Features
Sep 1, 2025Month: 2025-09 — Google Kotlin repository (google/kotlin) contributed a focused feature to improve incremental build testing in a multi-module setup. Delivered an incremental multiproject test scenario for Build Tool API (BTA) tests, including Kotlin source files and a dedicated test class, designed to simulate a realistic multiproject project structure for incremental compilation testing. This work establishes a repeatable test environment to debug incremental build scenarios in multiproject configurations, enabling faster diagnosis of build-tool related issues and higher confidence in incremental compilation behavior across modules. Commit reference: cae074705afec9643b6b14cc5ae2179eafcaf003 with message "[Test] Add incremental multiproject to BTA tests"
September 2025
July 2025
3 Commits • 2 Features
Jul 1, 2025July 2025 - Focused on performance, reliability, and observability in the Kotlin compiler and toolchain. Key work included an incremental compilation optimization that ignores non-ABI debug-info changes, expanded test coverage for inline property accessors in value classes, and added telemetry for the useFirRunner option with an integration test. These efforts reduce rebuilds, improve regression safety, and enhance data-driven decisions in JVM FIR builds.
July 2025
3 Commits • 2 Features
Jul 1, 2025July 2025 - Focused on performance, reliability, and observability in the Kotlin compiler and toolchain. Key work included an incremental compilation optimization that ignores non-ABI debug-info changes, expanded test coverage for inline property accessors in value classes, and added telemetry for the useFirRunner option with an integration test. These efforts reduce rebuilds, improve regression safety, and enhance data-driven decisions in JVM FIR builds.
June 2025
1 Commits
Jun 1, 2025June 2025: Stabilized incremental compilation in google/kotlin by restoring the IncrementalCache API surface and reintroducing essential data retrieval methods. Reverted a previous removal and re-enabled access to obsolete multifile class facades, package part data, and class file paths to restore incremental compilation functionality and improve rebuild performance.
1 Commits
Jun 1, 2025June 2025: Stabilized incremental compilation in google/kotlin by restoring the IncrementalCache API surface and reintroducing essential data retrieval methods. Reverted a previous removal and re-enabled access to obsolete multifile class facades, package part data, and class file paths to restore incremental compilation functionality and improve rebuild performance.
June 2025
May 2025
2 Commits • 2 Features
May 1, 2025May 2025 monthly summary for google/kotlin: Delivered targeted performance and reliability improvements in incremental compilation through (1) detailed snapshotting of inlined local classes for cross-module scenarios and (2) cleanup of the IncrementalCache API surface. These changes reduce build times and improve accuracy of incremental compilation, while simplifying the API surface for developers.
May 2025
2 Commits • 2 Features
May 1, 2025May 2025 monthly summary for google/kotlin: Delivered targeted performance and reliability improvements in incremental compilation through (1) detailed snapshotting of inlined local classes for cross-module scenarios and (2) cleanup of the IncrementalCache API surface. These changes reduce build times and improve accuracy of incremental compilation, while simplifying the API surface for developers.
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Quality Metrics
Correctness91.4%
Maintainability88.6%
Architecture90.0%
Performance84.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaKotlin
Technical Skills
API DesignBuild SystemsBuild Tool API TestingBuild ToolsCI/CDCode CleanupCompiler APICompiler InternalsCompiler TestingGradleIncremental CompilationIncremental Compilation TestingJVMKotlinKotlin Language Features
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