Javier Julio
Staff Engineer at DraftKings Inc.
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolJavier Julio is a Staff Engineer based in Brooklyn with over 16 years of hands-on experience building full-stack Ruby on Rails applications and developer tools. He’s been a founding-team engineer at Jackpocket and now contributes at DraftKings, bringing product-minded technical leadership to high-growth teams. An active open-source maintainer in the Rails community, he has improved testing and maintainability across prominent projects like ActiveAdmin and rspec-rails and modernized front-end tooling in legacy plugins. Known for pragmatic refactors—removing deprecated components, tightening test suites, and migrating docs and build systems—he balances incremental improvements with larger migrations. Outside of code he organizes community training (RailsBridgeNYC) and uniquely brings a parrillero’s patience to complex engineering problems.
16 years of coding experience
9 years of employment as a software developer
A.A.S. in Web Programming Computer Science, A.A.S. in Web Programming Computer Science at Montgomery CollegeWalter Johnson High School
Spanish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (21)
ruby-rails10
javascript10
jquery10
testing10
rspec10
rails10
forms10
ruby10
activeadmin10
html10
minitest10
ruby-on-rails10
test-automation10
css9
tailwindcss9
Programming languages (15)
Github contributions (5)
activeadmin/activeadmin
Mar 2015 - Jan 2023
The administration framework for Ruby on Rails applications.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:16 releases, 497 reviews, 299 commits in 7 years 11 months
Contributions summary:Javier primarily focused on maintaining and refactoring the ActiveAdmin framework, a Ruby on Rails administration framework. They removed outdated components, such as the popover component, and cleaned up code by addressing whitespace issues and deprecations, thereby improving the codebase's maintainability. Furthermore, they added features like indeterminate checkbox support and integrated improvements related to the form and filter components. Their contributions also included the migration to the new importmap-rails and VitePress with docs setup.
ruby-on-railsrails-applicationsrailsadministrationarbre
activeadmin/inherited_resources
Sep 2018 - May 2021
Role in this project:Back-end Developer
Back-end DeveloperContributions:93 reviews, 74 commits, 102 PRs in 2 years 7 months
Contributions summary:Javier primarily focused on maintaining and improving the test suite for the `inherited_resources` Rails gem. Their contributions include adding new test cases, updating existing ones, and refactoring test code to use a consistent `test_helper` and remove deprecated features. The user also removed unnecessary conditions and dependencies related to older Rails versions, simplifying the codebase. Furthermore, the user addressed test failures and warnings, leading to a more robust and reliable testing environment.
rails
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