Robert Kieffer
Senior Software Engineer at CodePen
Bend, Oregon, United States
Summary
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RockstarRobert Kieffer is a Senior Software Engineer with 16 years of experience, currently building products at CodePen from Bend, Oregon. He is a pragmatic full‑stack developer known for improving developer tooling and libraries—contributing to notable open-source projects like a popular prettier import-sorting plugin, mime type utilities, and the uuid.js implementation. Robert focuses on code quality and performance, adding tests, refactoring for clarity, and optimizing hot paths such as array reuse and binary UUID support. Comfortable across front-end and back-end concerns, he brings a steady blend of maintenance-first craftsmanship and feature delivery that keeps developer ecosystems robust and reliable.
16 years of coding experience
Github Skills (20)
parserator10
javascript10
parser10
lib10
testing10
typescript10
plugin10
pretier10
import-data10
uuid10
uid10
performance-optimization10
typescript-types10
prettify10
typescripts10
Programming languages (23)
Github contributions (5)
broofa/mime
Aug 2010 - Dec 2022
Mime types for JavaScript
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 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.
javascriptmime-types
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.
javascriptrfc
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