Jakob Külzer
Senior Infrastructure Engineer at Shopify Inc
Old Toronto, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolJakob Külzer is a Senior Infrastructure Engineer with 17 years of experience, currently shaping reliability and scale at Shopify from Old Toronto. He blends hands-on back-end engineering and test automation—contributing to notable open-source tooling like Shopify's themekit by hardening rate limiting and improving test coverage—with operational discipline for large distributed systems. His background in computer science from Hochschule München informs a pragmatic approach to observability, configuration management, and resilient service behavior. Colleagues rely on him to translate complex failure modes into durable fixes and clearer tests, and he brings an unusual mix of shipping-focused operational mindset with a developer’s attention to code quality.
17 years of coding experience
Bachelor, Computer Science, Bachelor, Computer Science at Hochschule München
English, German
Stackoverflow
1,753reputation
121kreached
56answers
5questions
apache-flex
top-5%
Github Skills (15)
go10
shopify10
testing10
apache-flex9
configuration-management9
error-handling8
actionscript6
tomcat6
osgi6
java6
maven6
apache-felix6
flash6
forgot-password6
sling6
Programming languages (10)
Github contributions (5)
Shopify/themekit
Dec 2015 - Aug 2016
Shopify theme development command line tool.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:3 releases, 23 commits, 21 PRs in 7 months
Contributions summary:Jakob primarily contributed to improving the `themekit` tool's functionality and reliability. They focused on implementing and refining a leaky bucket rate-limiting mechanism within the Go codebase, as well as improving existing tests. The commits also involved adding new tests and assertions, and refactoring existing ones to enhance code quality and test coverage. Additionally, the user made changes to the configuration loading and environment handling to improve error handling.
theme-kitclicommand-line-toolshopify-themethemekit
ilikeorangutans/phts
Jun 2017 - Jun 2020
Contributions:3 PRs, 135 pushes, 27 branches in 3 years
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