Robert Kieffer
Senior Software Engineer at CodePen
Bend, Oregon, United States
Summary
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RockstarRobert Kieffer is a Senior Software Engineer based in Bend, Oregon with 15 years of experience building full‑stack web tooling and developer-focused libraries. Currently at CodePen, he blends backend and frontend expertise to ship performant, well-tested features that improve developer ergonomics. An active open-source contributor, Robert has enhanced widely used projects like uuid.js—adding binary UUID support, array reuse, and browser tests—and driven reliability improvements in trivago's prettier-plugin-sort-imports. He also fortifies core JavaScript utilities such as broofa/mime with reverse lookups and robustness fixes, showing a pragmatic focus on performance, accuracy, and maintainability.
16 years of coding experience
Github Skills (25)
parserator10
javascript10
typescript310
parser10
lib10
testing10
typescript10
typescript210
plugin10
pretier10
importdata10
uuid10
uid10
javascripts10
performance-optimization10
Programming languages (20)
Github contributions (5)
broofa/mime
Aug 2010 - Dec 2022
Mime types for JavaScript
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 releases, 1 review, 243 commits in 12 years 5 months
Contributions summary:Robert's commits primarily involve modifying and enhancing the core functionality of a JavaScript library related to MIME types. They added a reverse lookup feature based on MIME types, enabling the retrieval of file extensions. The commits also include refactoring code, fixing bugs related to whitespace, and improving error messages, all contributing to the library's overall robustness. The user seems focused on improving the library's accuracy and efficiency.
mime-typesjavascriptmagic-numbersmimetypescript
uuidjs/uuid
Dec 2010 - Jan 2023
Generate RFC-compliant UUIDs in JavaScript
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:3 releases, 97 reviews, 175 commits in 12 years 2 months
Contributions summary:Robert contributed to the development of the uuid.js library, focusing on both performance optimizations and feature additions. They implemented several code cleanups to improve the overall quality of the library. Moreover, the user worked on performance enhancements like reusing arrays, and added support for binary uuids. They also addressed performance issues, optimized code, and added support for browser testing.
uuid-generatoruidnanoidcompliantjavascript
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