John Koster
Principal Engineer at Amazon
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolJohn Koster is a Principal Engineer based in Seattle with 13 years of experience building large-scale measurement and data systems at Amazon, where he progressed from SDE I to Principal since 2013. He brings a research-driven mindset from a Ph.D. in Physics and postdoctoral work, applying rigorous problem solving to production engineering and long-lived systems. Comfortable across back-end stacks, he contributes to open-source projects like the popular Statamic CMS—improving runtime parsing, memory use, and useful developer features—reflecting a focus on robustness and developer ergonomics. Known for enjoying collaborative build-and-ship work, he blends deep technical craft with mentorship and pragmatic delivery in data-intensive environments.
12 years of coding experience
15 years of employment as a software developer
Ph.D. Physics, Ph.D. Physics at University of Illinois Urbana-ChampaignB.A. Physics Mathematics, B.A. Physics Mathematics at Bowdoin College
Github Skills (11)
cms10
php10
laravel10
back-end-development10
package10
compose10
laravel-mix10
composer9
debug8
debugging8
testing8
Programming languages (5)
Github contributions (5)
statamic/cms
Dec 2021 - Jan 2023
The core Laravel CMS Composer package
Role in this project:
Back-end Developer
Back-end DeveloperContributions:24 reviews, 79 commits, 191 PRs in 1 year 1 month
Contributions summary:John primarily contributed to the Statamic CMS back-end, adding features such as a new "increment:reset" tag for managing counters and the "compact" modifier, which converts variables to arrays. Their work also included bug fixes for existing functionalities, specifically resolving extraction issues within Blade layouts and addressing memory leaks. Furthermore, the user implemented improvements to the Antlers runtime parser and addressed several runtime bug fixes.
cmsssgprestashop-modulelaravel10composer
Stillat/meerkat-statamic3
Jul 2020 - Dec 2022
Meerkat 2 is an extremely powerful and easy-to-use comment platform for Statamic 3.
Contributions:73 releases, 481 commits, 27 PRs in 2 years 5 months
statamiclaravelstatamic-3commentsmeerkat
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