Paul Shannessy
Engineering Manager at Meta
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolPaul Shannessy is an engineering manager in Seattle with 18 years of hands-on web and browser engineering experience and a long tenure at Meta where he transitioned from software engineer to manager. He combines full-stack fluency—server-side build tooling, React-based front-ends, and site infrastructure—with a history of contributing to high-profile open-source projects like React, Jest, Relay, and React Native. Paul's work often focuses on improving developer experience and build/deploy processes, modernizing codebases, and refactoring for maintainability and performance. His background includes deep browser-level experience from Mozilla, giving him rare insight into both platform and application layers of the web. He is the sort of leader who still ships code, routinely contributing fixes and site improvements across major projects while coaching teams. Colleagues benefit from his pragmatic approach to engineering trade-offs and his knack for surfacing hidden build and tooling debt.
18 years of coding experience
7 years of employment as a software developer
BS, BS at Carnegie Mellon University
Stackoverflow
2,498reputation
364kreached
21answers
0questions
javascript
top-5%
dom
top-5%
Github Skills (79)
website-development10
addin10
flow-control10
expressjs10
ui-components10
testing10
plugin-development10
ruby10
svg10
web-deployment10
build-automation10
website-design10
jsx10
javascript10
gulp10
Programming languages (26)
Github contributions (5)
reactjs/express-react-views
Mar 2014 - Jan 2022
This is an Express view engine which renders React components on server. It renders static markup and *does not* support mounting those views on the client.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:103 commits, 48 PRs, 50 pushes in 7 years 11 months
Contributions summary:Paul primarily contributed to the development and maintenance of the `express-react-views` library, focusing on server-side rendering of React components within an Express.js environment. Their work included improving the core functionality, such as exporting the `createEngine` function and refactoring the code to use `React.createElement`. They also addressed the use of Babel for ES6+ support and enhanced the example applications. Additionally, they updated the library to support React 0.14 and Babel 6, and refactored the project to use `object-assign` and prettier.
reactview-enginejavascriptexpresson-server
facebook/fbjs
May 2015 - Apr 2022
A collection of utility libraries used by other Meta JS projects.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:4 reviews, 339 commits, 219 PRs in 6 years 11 months
Contributions summary:Paul primarily worked on improving and maintaining the `fbjs` library, contributing to its core functionality. Their work included implementing new modules, such as the module map and a set module, and refactoring existing code for better robustness and maintainability. They also integrated changes from related projects like React, bringing in updated scripts and functionality. Additionally, the user updated dependencies and enhanced the build process to compile JavaScript code while including Flow comments and JSX support.
javascriptjs-projectsfacebook
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