Jesse Cooke
Founder And CTO at Ratio PBC
Portland, Oregon, United States
Summary
🤩
Rockstar🎓
Top SchoolJesse Cooke is a founder and technical leader with 16 years building resilient web and integrations platforms from startups to public-health tech. Based in Portland, he blends deep backend expertise in Ruby and Elixir with practical product delivery—shipping everything from EMR integration services and Rails-to-Postgres migrations to rapid e-commerce prototypes. He co-founded Watsi’s fundraising platform and now leads Ratio PBC to maintain COVID response tooling and UBI infrastructure, pairing mission-driven work with pragmatic engineering. An active open-source contributor, Jesse has improved critical Ruby ecosystem projects like Puma and Sidekiq, demonstrating attention to robustness (Rack compliance, PID/config management) and deployment ergonomics. He holds a math degree from Washington University and is known for turning complex operational needs into automated, time-saving tools that cut human effort dramatically.
17 years of coding experience
10 years of employment as a software developer
Bachelor's degree Mathematics, Bachelor's degree Mathematics at Washington University in St. Louis
Stackoverflow
2,485reputation
3.5mreached
11answers
1question
github
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Github Skills (35)
spec10
programming-language10
configuration-management10
command-line-interface10
virtual-machine10
file-operations10
ruby10
lang10
mspec10
rubyspec10
command-line10
rack10
test-suite10
devops10
server10
Programming languages (31)
Github contributions (5)
ruby/spec
May 2011 - Dec 2014
The Ruby Spec Suite aka ruby/spec
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:27 commits, 7 comments, 1 issue in 3 years 8 months
Contributions summary:Jesse primarily contributed to the ruby/spec repository by adding and modifying specifications for Ruby language features. The contributions involved creating new test cases and adjusting existing ones to cover various scenarios, including edge cases and handling different data types. The user focused on testing core Ruby classes and methods, such as `File`, `BasicObject`, `Range`, and `Time`. The changes ensure the accuracy and reliability of the Ruby language implementation.
rubylanguage-specsmspecrubyspec
rubinius/rubinius
May 2011 - Sep 2019
The Rubinius Language Platform
Role in this project:Back-end Developer
Back-end DeveloperContributions:128 commits, 8 PRs, 12 pushes in 8 years 5 months
Contributions summary:Jesse primarily contributed to the Rubinius language platform by implementing and fixing core Ruby language features. Their work included adding and refining methods related to file operations (e.g., `File.directory?`, `File#world_readable?`, `File#identical?`) and numeric types (e.g., `Numeric#to_c`, `Float#round`). Additionally, they addressed bugs and implemented specs to improve the platform's overall functionality and adherence to Ruby standards.
rubiniusprogramming-languagesvirtual-machine
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