Justin Fagnani
Founder at Stealth Startup
Oakland, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJustin Fagnani is a founder and senior software engineer with 13 years of experience building developer tools and web platform technologies from prototype to production. Based in Oakland, he led Google's Polymer and Lit projects—creating lit-html/Lit and driving Polymer 3's migration to modern web standards—while founding the Polymer Tools team that produced dev servers, build systems, and doc generators. Equally comfortable in tooling and components, his open-source work spans core webcomponents polyfills, Polymer, and Lit, with hands-on contributions to testing, documentation generation, and component primitives. Now leading a stealth startup focused on next‑generation software design and development tools, he combines deep browser/templating expertise with a history of shipping developer-facing platforms. An early practitioner of web components at Google, he brings rare institutional knowledge of how browser APIs, build tooling, and developer workflows fit together.
13 years of coding experience
25 years of employment as a software developer
Montgomery Blair High SchoolUniversity of California Santa CruzCabrillo College
Stackoverflow
10,867reputation
602kreached
163answers
8questions
flutter
top-5%
dart
top-1%
polymer
top-5%
javascript
top-5%
Github Skills (30)
unit-testing10
lit-element10
javascript10
ui-components10
testing10
css10
polymer10
typescript10
web-components10
html-template10
decorator10
decorators10
lit-html10
front-end-development10
typescript-types10
Programming languages (18)
Github contributions (5)
Polymer/designer
Feb 2015 - Jul 2017
Polymer Designer Tool
Role in this project:
Front-end Developer
Front-end DeveloperContributions:389 commits, 164 PRs, 172 pushes in 2 years 5 months
Contributions summary:Justin primarily contributed to the development of UI components within the Polymer Designer Tool. Their work focused on creating and implementing interactive elements such as `designer-selection`, `designer-stage`, and `designer-element-palette`. These contributions included writing HTML, CSS, and JavaScript code to define the structure, styling, and behavior of the components, as well as integrating with the underlying Polymer framework. The user also contributed to a basic file system.
designerpolymer
lit/lit
Jun 2017 - Jan 2023
Lit is a simple library for building fast, lightweight web components.
Role in this project:Front-end Developer
Front-end DeveloperContributions:29 releases, 1904 reviews, 619 commits in 5 years 7 months
Contributions summary:Justin has primarily contributed to front-end component development within the lit/lit repository, which is a simple library for building fast, lightweight web components using HTML templates, lit-element, and lit-html. Their work focuses on enhancing the rendering and functionality of web components, and on testing, ensuring their functionality, and rendering and performance as intended. The commits demonstrate contributions to features like attribute and boolean property handling.
litlit-elementweb-componentsjavascriptwebcomponents
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