Stefan Karpinski
Chief Product Officer at JuliaHub
New York, New York, United States
Summary
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Top expert inScientific Computing and Data Science
Stefan Karpinski is a co-creator of the Julia programming language and Chief Product Officer at JuliaHub with 18 years of experience building high-performance, numerics-focused developer tooling and infrastructure. He combines research-grade technical depth—shaped by a PhD track in computer science and roles at MIT, Akamai, Citrix, and Etsy—with product leadership at a company commercializing a language used broadly in scientific and data-science communities. Stefan remains hands-on in core engineering: notable open-source contributions include work on the julia language itself, the Pkg package manager, the IJulia Jupyter kernel, and the yggdrasil binary build automation system that ships native dependencies for Julia packages. Based in New York, he splits his time between scaling product offerings and an academic appointment at NYU, reflecting a sustained bridge between cutting-edge research and production-grade software. Colleagues know him for digging into tricky numerical edge cases and build automation details that most leaders leave to others, which has helped make Julia robust and production-ready.
18 years of coding experience
14 years of employment as a software developer
BA, Mathematics, Computer Science, BA, Mathematics, Computer Science at Harvard UniversityPhD, Computer Science, PhD, Computer Science at UC Santa Barbarahigh school, high school at Regis High School
Stackoverflow
32,939reputation
654kreached
224answers
2questions
parallel-processing
top-5%
r
top-5%
conditional-statements
top-5%
elixir
top-5%
julia
top-1%
lisp
top-5%
Github Skills (64)
git10
site-design10
debug10
maintenance10
frank10
package-management10
jupyter10
scripting10
css10
ipython10
build-system10
metadata10
automation10
pbuilder10
f10
Programming languages (23)
Github contributions (5)
JuliaLang/www_old.julialang.org
Nov 2011 - Oct 2017
Julia Project web site (Old)
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:343 commits, 26 PRs, 119 pushes in 5 years 11 months
Contributions summary:Stefan primarily contributed to the website's front-end development. Their initial commits involved creating a basic "Hello, world" page and subsequent updates focused on improving the HTML structure and content. They also added and modified CSS files to control the website's appearance. Later commits included updates to the layout and content to incorporate blog functionality and further enhancements to the site's overall design and structure.
julia-languageweb-sitejulialangweb-projectjulia
JuliaLang/julia
Aug 2009 - Dec 2022
The Julia Programming Language
Role in this project:Back-end Developer
Back-end DeveloperContributions:221 reviews, 4349 commits, 1436 PRs in 13 years 6 months
Contributions summary:Stefan's commits focus on addressing indexing issues and improving code clarity within the Julia Programming Language repository. Contributions include fixing a specific indexing problem involving `FloatRange` and `OrdinalRange` and refactoring the code for printing `@time` results, indicating expertise in debugging and performance optimization. Further commits show a focus on refining range behavior and rational printing, highlighting a dedication to code quality and numerical computing within the language. The user also implemented and addressed edge-case issues for the `linspace` method.
sciencejulia-languagemachine-learningjulialangpetsc
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