Matthew Costabile
Staff Software Engineer at GitHub
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolMatthew Costabile is a Staff Software Engineer in New York with a decade of experience building scalable full-stack systems and polished front-end experiences. Currently at GitHub, he progressed from senior to staff roles while contributing to high-profile open-source projects like Primer React and MSW, where he improved UI components, GraphQL handling, and cross-environment test stability. He blends hands-on React and Node expertise with systems thinking from leading client-facing teams and re-architecting back-end services at startups and enterprises. A former freelance photographer and legal assistant, he brings a pragmatic eye for UX and disciplined project execution uncommon in engineering leaders.
10 years of coding experience
7 years of employment as a software developer
Certificate, Full Stack Web Development, Certificate, Full Stack Web Development at New York Code + Design AcademyBachelors of Arts, Economics, Bachelors of Arts, Economics at City University of New York-Hunter College
Github Skills (20)
javascript10
testing10
typescript10
system-design10
carbon-design-system10
wpgraphql10
mocks10
component-library10
sys10
wordpress-graphql10
typescript-types10
mocking10
graphql10
typescripts10
react10
Programming languages (8)
Github contributions (5)
primer/react
Jul 2021 - Jan 2023
An implementation of GitHub's Primer Design System using React
Role in this project:
Front-end Developer
Front-end DeveloperContributions:94 reviews, 14 commits, 42 PRs in 1 year 6 months
Contributions summary:Matthew primarily contributed to the implementation and refinement of UI components using React within the Primer React design system. They focused on integrating color schemes, updating button properties, and ensuring correct type checking for props. Their work involved modifying existing components, adding new features, and updating documentation to reflect the changes. They also contributed to the update of dependencies and ensuring the code base was in a healthy state.
primerreactprimer-designdesign-systemcomponent-library
mswjs/msw
Aug 2020 - Nov 2022
Industry standard API mocking for JavaScript.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:120 reviews, 4 commits, 28 PRs in 2 years 3 months
Contributions summary:Matthew contributed to the MSW (Mock Service Worker) repository by addressing dependencies and improving functionality related to GraphQL requests. Their work included updating dependencies, modifying the code base to handle GraphQL imports, and resolving errors. They also added regression tests for the Miniflare environment and addressed issues causing problems in JSDOM environments.
api-mockingmockingmocking-librarymockbrowser
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