Leo Kettmeir - Software Engineer at Deno

Leo Kettmeir

Software Engineer at Deno

Rotterdam, South Holland, Netherlands

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Summary

🤩

Rockstar

🎓

Top School

Leo Kettmeir is a software engineer with nine years of experience, currently building core runtime infrastructure in Rust for Deno and shaping Web APIs like WebSocket and WebGPU. He contributes across the full stack—from low-level runtime and graphics integration to front-end UX fixes for deno.land—demonstrating a rare mix of systems-level rigor and product-focused polish. His work on widely used projects such as deno, wgpu, and the Deno standard library emphasizes stability, resource management, and improved developer ergonomics. Based in Rotterdam, he brings disciplined open-source engineering practices to both backend implementations and test automation, and often surfaces subtle improvements like enhanced URL parsing and refined command buffer handling.

9 years of coding experience

MYP4, MYP5, DP1, MYP4, MYP5, DP1 at H-FARM International School

The English International School of Padua

Github Skills (35)

deno10

javascript10

apidoc10

routers10

testing10

router10

typescript10

graphics-engine10

user-interface10

websocket10

url-parsing10

api10

front-end-development10

webgpu10

typescript-types10

Programming languages (19)

C#MDXJavaC++CSSBikeshedRustC

Github contributions (5)

denoland/dotland

Apr 2020 - Jan 2023

[Archived] deno.land website

Role in this project:

Front-end Developer

Contributions:182 reviews, 303 commits, 396 PRs in 2 years 10 months

Contributions summary:Leo primarily contributed to the `denoland/dotland` repository by addressing UI-related issues and refactoring existing code. Their work included fixing issues with the mobile sidebar and modifying existing components such as the footer and markdown components. The user also implemented the addition of a code view option to display the source code within the module pages.

deno-deploydeno-moduledenolandtypescript

denoland/std

Mar 2020 - Dec 2022

The Deno Standard Library

Role in this project:

Back-end Developer

Contributions:1 release, 69 reviews, 24 commits in 2 years 9 months

Contributions summary:Leo contributed several features to the Deno standard library. The primary focus was on providing a polyfill for Node.js's `querystring` module, including implementing parsing and stringifying functionalities. They also added support for protocol and version handling in the `ws` (WebSockets) module and deprecated the `ws` module. The user also refactored and fixed some issues in existing modules.

deno-deploydeno-modulejavascriptstandard-librarydeno

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