Katie Sylor-miller
Principal Engineer at Square
Boston, Massachusetts, United States
Summary
🤩
Rockstar🎓
Top SchoolKatie Sylor-Miller is a Principal Engineer with nine years of senior-level experience in frontend architecture, web performance, and design systems, currently leading platform work at Square after a transformative tenure at Etsy. She combines data-driven performance engineering with pragmatic frontend modernization—her initiatives at Etsy contributed to roughly $100M in annualized GMS growth and measurable infrastructure and cost savings. A practical inventor of concepts like “Component Islands,” she has led cross-team roadmaps, migrated large-scale pipelines, and evangelized adoption of modern stacks (TypeScript, Preact, Webpack). Katie is also the creator/maintainer behind the widely used ohshitgit.com resource, reflecting her knack for clear developer tooling and documentation. Based in Boston, she blends technical leadership, public speaking, and developer experience work to make complex frontend systems faster, safer, and more maintainable.
8 years of coding experience
16 years of employment as a software developer
ALB Computer Science, ALB Computer Science at Harvard Extension School
Stackoverflow
1reputation
303reached
0answers
1question
Github Skills (7)
html10
css10
javascript10
eleventy9
ux-design8
ui-design8
apache-flex6
Programming languages (6)
Github contributions (5)
ksylor/ohshitgit
Apr 2019 - Mar 2021
The official home of Oh Shit, Git!?!
Role in this project:
Front-end Developer
Front-end DeveloperContributions:29 reviews, 38 commits, 86 PRs in 1 year 10 months
Contributions summary:Katie primarily focused on front-end development, as evidenced by changes to the `index.html` file and the inclusion of CSS and JavaScript. They implemented the language picker feature and improved the overall UI/UX of the website. These changes involved refactoring existing CSS and adding new CSS styles for better readability and responsiveness.
ksylor/baby-hacks
Apr 2021 - Apr 2021
Contributions:21 commits, 14 pushes in 8 days
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