Frederick Kellison-linn - Engineering at The Browser Company

Frederick Kellison-linn

Engineering at The Browser Company

New York, New York, United States

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Summary

🤩

Rockstar

🎓

Top School

Frederick Kellison-linn is an experienced engineer with 14 years building mobile and systems software across startups and major tech companies, currently contributing at The Browser Company out of New York. He has a strong iOS and backend background from roles at Duolingo, Vimeo, Apple, and Google, plus leadership experience running TechUplink where he led development and operations. Frederick is an active open-source contributor to core projects like the Swift compiler and cross-platform networking libraries (Kitura/BlueSocket), where he improved keypath type-checking and hardened UDP/TCP behavior for Linux and Apple platforms. His work spans low-level C virtual machine improvements to higher-level compiler correctness, showing comfort across stacks and languages. Known for clean problem-solving and cross-platform thinking, he pairs production shipping experience with deep technical contributions that often address subtle correctness and portability issues. A Columbia Computer Science graduate, he brings both industry-scale product delivery and systems-level craftsmanship.

14 years of coding experience

10 years of employment as a software developer

Palo Alto High School

Bachelor of Science (B.S.), Computer Science, Bachelor of Science (B.S.), Computer Science at Columbia University

Spanish

Stackoverflow

Stats

6,747reputation

517kreached

92answers

88questions

Github Skills (27)

unit-testing10

udp10

type-check10

linux10

virtual-machine10

c1110

networking10

data-structure10

c1710

socket10

hashtable10

data-structures10

swift10

type-checking10

compiler-development9

Programming languages (6)

JavaC++CJavaScriptSwiftMarkdown

Github contributions (5)

swiftlang/swift

Dec 2015 - Nov 2024

The Swift Programming Language

Role in this project:

Back-end Developer

Contributions:85 reviews, 29 PRs, 3 pushes in 9 years

Contributions summary:Frederick primarily focused on modifying and improving the Swift compiler, specifically related to type checking and keypath functionalities. Their contributions involved addressing issues in pattern matching, enhancing function-function conversions for keypaths, and fixing solution application logic for keypath subtype conversions. Additionally, the user added new tests to validate the correctness of keypath-related features and ensure proper overload selection.

swift-programmingswift-programming-languageprogramming-languageswift

Kitura/BlueSocket

Nov 2016 - Dec 2016

Socket framework for Swift using the Swift Package Manager. Works on iOS, macOS, and Linux.

Role in this project:

Back-end Developer

Contributions:14 commits, 9 PRs, 26 comments in 9 days

Contributions summary:Frederick primarily contributed to the socket framework, focusing on expanding its functionality and improving its robustness. They implemented UDP write stubs, added comprehensive UDP tests, and included the capability to truncate TCP and UDP messages, enhancing the framework's flexibility. Furthermore, the user addressed code issues, fixed merge conflicts, and resolved Linux build issues, ensuring cross-platform compatibility.

swift-package-managersocketswift-packagelinuxnetworking

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