Stefan Penner
Senior Staff Engineer at LinkedIn
Salt Lake City, Utah, United States
Summary
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RockstarStefan Penner is a Senior Staff Engineer with 17 years of experience, currently driving platform and developer-experience work out of Salt Lake City at LinkedIn. He excels at root-cause analysis and reliability improvements, routinely hunting down memory leaks, test flakiness, and subtle runtime bugs across front-end and build tooling. A prolific open-source maintainer and contributor to cornerstone projects in the Ember ecosystem (ember-engines, ember-data, ember-test-helpers, embroider) and broader tooling (broccoli, testem, es6-promise), he blends deep framework knowledge with practical build- and QA-focused fixes. Stefan’s background spans full-stack changes—from C++ memory fixes in node-sass to JS router bug resolutions—highlighting an uncommon comfort crossing language and layer boundaries. Colleagues rely on him for stabilizing legacy systems and modernizing build/test infrastructure while keeping developer workflows fast and sane.
17 years of coding experience
2 years of employment as a software developer
Stackoverflow
1,087reputation
41kreached
25answers
0questions
Github Skills (77)
testing10
command-line-interface10
ember-cli10
test-framework10
data-management10
ruby10
emberjs10
qunit10
build-automation10
pdf-generation10
markdown10
javascript10
reveal-js10
es6-promise10
memory-management10
Programming languages (17)
Github contributions (5)
stefanpenner/es6-promise
May 2014 - Nov 2022
A polyfill for ES6-style Promises
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:248 commits, 178 PRs, 221 pushes in 8 years 7 months
Contributions summary:Stefan primarily contributed to the `es6-promise` library, focusing on improving the code's quality and compatibility. They made significant changes to tests, corrected test failures, and fixed issues. Their work involved ensuring the library's compliance with the ES6 specification, removing deprecated code, and refactoring internal components.
polyfilljavascriptes6promisescallback
tildeio/rsvp.js
Jan 2013 - Jun 2019
A lightweight library that provides tools for organizing asynchronous code
Role in this project:Front-end Developer
Front-end DeveloperContributions:633 commits, 140 PRs, 200 pushes in 6 years 6 months
Contributions summary:Stefan primarily focused on improving the core functionalities of the RSVP.js library. They fixed a memory leak related to the MutationObserver in browser/rsvp.js. The user also implemented and tested RSVP.resolve, and several other methods.
semaphoreasynchronouscallbacksjavascriptpromises
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