Chris Sinjakli
Infra Engineer at PlanetScale
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolChris Sinjakli is an Infra Engineer based in London with 17 years of experience building resilient systems where software and operations intersect, currently focused on infrastructure at PlanetScale. He has deep expertise in databases and distributed systems from senior SRE and technical lead roles at GoCardless, and contributes to high-profile open source projects in the Ruby ecosystem, including significant robustness work on prometheus/client_ruby and compatibility improvements to marginalia. Comfortable in both Java and Ruby, he has solved subtle runtime and edge-case bugs (e.g., JRuby timezones and Prometheus label handling), demonstrating an eye for brittle failure modes. Known for pragmatic, hands-on craftsmanship, he blends systems-level thinking with careful, test-driven improvements to production tooling.
17 years of coding experience
10 years of employment as a software developer
Bachelor of Science, Computer Science, 2.i Honours, Bachelor of Science, Computer Science, 2.i Honours at University of Warwick
English, Spanish
Github Skills (22)
ruby-rails10
jvm10
testing10
rails10
java10
ruby10
javas10
prometheus10
jruby10
actioncontroller9
activerecord9
test-automation8
cgi8
base647
erb7
Programming languages (13)
Github contributions (5)
prometheus/client_ruby
Apr 2019 - Dec 2022
Prometheus instrumentation library for Ruby applications
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 releases, 38 reviews, 76 commits in 3 years 8 months
Contributions summary:Chris primarily contributed to the `prometheus/client_ruby` library, focusing on the push client functionality. Their work involved implementing new features like arbitrary grouping keys, as well as fixing bugs related to handling edge cases such as empty instances, spaces, and special characters in label values. The user also refactored the push client by converting the argument passing method and introduced validation for label names. Overall, the user significantly enhanced the robustness and functionality of the Ruby client for the Prometheus push gateway.
instrumentationrack-middlewareprometheus-instrumentation-libraryrackruby-client
basecamp/marginalia
Sep 2014 - Dec 2014
Attach comments to ActiveRecord's SQL queries
Role in this project:Backend Developer
Backend DeveloperContributions:9 commits in 3 months
Contributions summary:Chris contributed to the `marginalia` library by adding features and making improvements to its functionality. They focused on enhancing the library's compatibility with Rails-API, updating test configurations, and adding the ability to record Rails request UUIDs. The changes included adjusting code to support different Rails versions and addressing pull request comments, demonstrating a focus on maintainability and broader compatibility.
attachsql-queriesrailssqlruby
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