Andrea Giammarchi

Milan, Lombardy, Italy

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Summary

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Rockstar

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Top School

Andrea Giammarchi is a JavaScript and web-standards expert with 17+ years of production experience and over five years focused on high-performance JS engineering for ad-blocking at scale. He’s the creator and maintainer of numerous open-source libraries with hundreds of millions of npm downloads, has contributed to high-profile projects like the js-framework-benchmark and Twemoji, and helped advance browser capabilities (including work on :has() via Igalia). Comfortable across the full stack—Node.js, PHP, C, Python, SQL and daily Linux/Bash—he emphasizes extreme performance, low memory footprint, and 100% test coverage in many projects. A pragmatic problem solver and occasional architecture blogger, Andrea balances deep language knowledge (JS/TypeScript via JSDoc) with standards work at TC39, WHATWG and Node.js. Though not chasing every trendy framework, he’s a fast learner with a track record of shipping code that runs on millions of devices.

17 years of coding experience

9 years of employment as a software developer

PHP and OOP in PHP, PHP and OOP in PHP at Zend Certified Engineer

CS50x, Computer Science, CS50x, Computer Science at CS50

HTML5, Computer Science, HTML5, Computer Science at edX

Java 2 basis + advanced, Java 2 basis + advanced at Sun Microsystem

Flash MX to MX2004 - ActionScript 1.0 / ActionScript 2.0, Flash MX to MX2004 - ActionScript 1.0 / ActionScript 2.0 at Macromedia - Certified ActionScript 2.0 Developer

CS50: CS50's Introduction to Computer Science, Computer Science, CS50: CS50's Introduction to Computer Science, Computer Science at HarvardX

Bachelor of Science (B.Sc.), Computer and Information Systems, Credentials Equivalency, Bachelor of Science (B.Sc.), Computer and Information Systems, Credentials Equivalency at Baruch College, City University of New York (CUNY)

Italian, English

Stackoverflow

Stats

57reputation

0reached

1answer

0questions

Github Skills (25)

benchmark10

javascript10

python10

testing10

dom-manipulation10

front-end-development10

html10

custom-element10

pyodide10

codemirror10

emoji9

compatible9

browser-support9

ui-design9

uid9

Programming languages (21)

MDXJavaBikeshedCSSC++RustMojoC

Github contributions (5)

WebReflection/document-register-element

Jul 2014 - Oct 2020

A stand-alone working lightweight version of the W3C Custom Elements specification

Role in this project:

Front-end Developer

Contributions:240 commits, 36 PRs, 222 pushes in 6 years 3 months

Contributions summary:Andrea's commit focuses on improving the state management in the `document-register-element` library. This includes adding support for the `DOMContentLoaded` event for older Android versions and addressing a PhantomJS test by adding a fix for nested elements with regards to innerHTML helper and its use. The user implemented a series of updates and fixes, targeting IE8 and Chrome.

stand-alonestandelementsspecificationw3c

WebReflection/jsx2tag

Jun 2021 - Sep 2022

Enable JSX for Template Literal Tags based projects.

Contributions:42 commits, 2 PRs, 32 pushes in 1 year 3 months

reacttemplate-literaljavascriptheadliteral

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