Liam Rosenfeld
Software Engineer at Apple
Sunnyvale, California, United States
Summary
👤
Senior🎓
Top SchoolLiam Rosenfeld is a software engineer at Apple with nine years of hands-on experience building productivity apps and core editing infrastructure, currently focused on canvas and editing systems. A computer engineering and mathematics student at the University of Florida (class of ’25), he’s shipped cross-platform features for Keynote, Pages, and Numbers as an Apple intern and now contributes to foundational app behavior at scale. He blends systems-level Rust and backend work—having built high-performance time-series services and WebAssembly-enabled editors—with macOS front-end improvements, including CLI integration and Swift Package Manager support for the well-known xi-editor mac frontend. Liam is also a first-author researcher on a visual code editor that enhances programming education, demonstrating an unusual mix of product-driven shipping and academic publishing early in his career. Based in Sunnyvale, he pairs low-level performance engineering with thoughtful UX-oriented features, making him effective at turning complex specs into polished, cross-platform functionality.
9 years of coding experience
3 years of employment as a software developer
High School Diploma, Engineering, High School Diploma, Engineering at Lyman High SchoolBachelor of Science - BS, Computer Engineering, Bachelor of Science - BS, Computer Engineering at University of Florida
Stackoverflow
546reputation
66kreached
5answers
3questions
Github Skills (20)
command-line-interface10
swift-package-manager10
command-line10
swift10
cli10
web-application9
develop9
application9
xcode8
testing8
automation7
automations7
macos7
firebase6
nsimage6
Programming languages (13)
Github contributions (5)
xi-editor/xi-mac
Oct 2018 - Mar 2020
The xi-editor mac frontend.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:17 commits, 12 PRs, 81 comments in 1 year 4 months
Contributions summary:Liam primarily focused on improving the usability and maintainability of the xi-mac editor, along with implementing essential CLI functionalities. They standardized copyright headers and automated their generation, enhancing code consistency. The user also added Swift Package Manager support and implemented a command-line interface (CLI) with options for file opening, waiting, and integration with git. This involved adding new source files, modifying the AppDelegate for CLI integration, and creating tests for the new CLI features.
macfrontendappkitmacoseditor
liamrosenfeld/liamrosenfeld.com
Mar 2019 - Oct 2024
My website
Contributions:3 PRs, 97 pushes, 13 branches in 5 years 8 months
react
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