Stefan Penner
Senior Staff Engineer at LinkedIn
Salt Lake City, Utah, United States
Summary
🤩
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 (21)
Github contributions (5)
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.
asynchronous
emberjs/router.js
May 2013 - Nov 2020
Role in this project:Back-end Developer
Back-end DeveloperContributions:12 reviews, 70 commits, 15 PRs in 7 years 7 months
Contributions summary:Stefan's commits primarily focus on bug fixes and code improvements within the router.js library. They addressed issues related to double resets and error handling, fixing a double reset error and ensuring errors are thrown using Error objects rather than strings. The user also improved the codebase through more idiomatic ES6 module usage and updating dependencies, demonstrating a focus on code quality and maintainability.
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