Igor Matuszewski - Software Engineer at Subzero Labs

Igor Matuszewski

Software Engineer at Subzero Labs

Warsaw, Masovian Voivodeship, Poland

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Summary

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Igor Matuszewski is a software engineer with 11 years of experience specializing in Rust, developer tooling, and build/release systems, based in Warsaw, Poland. He has driven core improvements across prominent Rust projects—including rustfmt, cargo, rust-analyzer and Servo—focusing on build automation, code generation, and robust testing infrastructure. At Parity and Nomic he worked on developer-facing systems and compilers, shipping cache and compiler-parser improvements that increased robustness and performance in real-world Ethereum and build workflows. Igor combines deep systems-level expertise (IPC, WebAssembly, low-level FFI safety) with practical DevOps sensibilities, having enhanced sccache, CI tooling, and release scripts. He’s shipped features that touch language tooling UX—like IDE assists and progress reporting—while also contributing to widely used open-source tools in the Rust ecosystem. Outside of obvious OSS footprints, he’s notable for bringing compiler-grade error recovery and cross-language safety practices into production developer tooling.

11 years of coding experience

7 years of employment as a software developer

Bachelor's degree Computer Science, Bachelor's degree Computer Science at University of Warsaw

Polish, English, Serbian

Stackoverflow

Stats

21reputation

1kreached

1answer

0questions

Github Skills (75)

visual-studio-code-extension10

cargo10

servo10

clientside10

testing10

http10

code-completion10

language-server-protocol10

code-generation10

build-automation10

javascript10

async10

browser10

ipc10

implement10

Programming languages (21)

C#JavaC++RustCGoHTMLGDScript

Github contributions (5)

rust-lang/vscode-rust

Mar 2017 - Aug 2022

Rust extension for Visual Studio Code

Role in this project:

Full-stack Developer

Contributions:366 commits, 189 PRs, 170 pushes in 5 years 5 months

Contributions summary:Igor primarily contributed to the development of the Rust extension for Visual Studio Code. Their commits demonstrate a focus on enhancing the user experience and stability of the extension by addressing issues related to the RLS analysis process, like introducing a status bar spinner and improving error handling. They also updated dependencies, refactored code, and added features to allow for logging server output. Moreover, they also defined a cargo watch task.

rustvisual-studio-codevscode-extension

racer-rust/racer

Nov 2018 - Apr 2022

Rust Code Completion utility

Role in this project:

Back-end Developer

Contributions:3 reviews, 41 commits, 25 PRs in 3 years 5 months

Contributions summary:Igor primarily contributes to the "racer-rust/racer" project, a Rust code completion utility, by modifying core Rust code. Their contributions include refactoring code to use `debug!` instead of `println!` for library code to improve RLS completion. They also adapted the code to the new standard library directory layout and fixed a bug related to deprecated error descriptions. Furthermore, they made improvements to the parsing of generics and handling of resolved generics in `Self`-returning methods.

code-completionrust

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