Anatolii Kmetiuk
Software Engineering Lead at Scala Center
Tokyo, Japan
Summary
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RockstarAnatolii Kmetiuk is a Software Engineering Lead based in Tokyo with 12 years of experience driving compiler and tooling work for the Scala ecosystem, currently helping bring Scala 3 into production with LAMP/EPFL. He combines deep compiler internals expertise—demonstrated by contributions to the Scala 3 compiler and scala/scala repos—with hands-on delivery of developer tools like sbt and scoverage. As a former Compiler Engineer at EPFL who created the Compiler Academy and modernized CI/CD, he blends technical leadership, release engineering, and community-building. Anatolii also has a strong background in data and ML pipelines, security-focused interactive training, and authoring technical books and courses, making him comfortable translating research-grade language features into production-ready systems. Notably, his contributions include nuanced fixes to Scala’s type system and REPL behavior, reflecting a focus on correctness and developer experience.
12 years of coding experience
8 years of employment as a software developer
English, Ukrainian, Russian, Japanese, French
Github Skills (16)
testing10
scala-compiler10
xml10
dotty10
type-system10
sbt10
code-generation10
compiler-design10
xsd10
scalajs10
scala10
debugging9
jvm-languages9
functional-programming8
functional-programming-language8
Programming languages (18)
Github contributions (5)
scala/scala3-example-project
Apr 2019 - May 2021
An example sbt project that compiles using Dotty
Role in this project:
Backend Developer
Backend DeveloperContributions:2 reviews, 27 commits, 5 PRs in 2 years 1 month
Contributions summary:Anatolii primarily focused on updating the Scala version in the `build.sbt` file, indicating a role in managing project dependencies and build configurations. They upgraded the Dotty (Scala 3) version throughout numerous commits, demonstrating active involvement in keeping the project up-to-date with the latest releases. Additionally, the user modified Scala source code files, which suggests they also contributed to the core logic of the Scala project. The changes reflect a project maintained to keep pace with the evolution of Scala 3.
dottysbtepflscala
scala/scala3
Mar 2019 - Dec 2022
The Scala 3 compiler, also known as Dotty.
Role in this project:Back-end Developer
Back-end DeveloperContributions:4 releases, 280 reviews, 833 commits in 3 years 10 months
Contributions summary:Anatolii's contributions focused on enhancing the Scala 3 compiler, specifically addressing subtyping comparisons of covariant type constructors and improving the REPL's handling of implicits. They implemented solutions for specific bugs, such as MatchError for imported Java enum Values. These changes reflect a deep understanding of the compiler's internals and type system, focusing on code correctness and user experience improvements. The changes primarily involve modifications to core type comparison and REPL code.
compilerdottyscalascala3epfl
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