Hi I’m Felix!

Developer Programs Engineer at Google / WordPress Core Committer

  • WordPress Core Committer
  • Plugin Developer
  • Conference Speaker
  • Multisite & REST API Maintainer
  • Community Member
  • World Traveller
  • Blogger

I’m @flixos90 on wordpress.org and @felixarntz elsewhere.

Projects I have contributed to

Latest Posts

Introducing Feature Policy & Reporting API for WordPress

Category: , March 13, 2019

Types, Subtypes, Meta, Options – An Abstract View On Data Structures in WordPress

Category: November 3, 2018

I’m Joining Google

Category: October 8, 2018

Core Contributions

I have been a WordPress Core Contributor since version 4.3 which was released in August 2015. I’m currently a component maintainer of the Multisite component and the REST API component, but regularly work in other areas as well. With WordPress version 4.6 I became one of the “Recent Rockstar” developers for the first time, and since November 2016 I have been a Core Committer.

Over the course of time I have opened 175 tickets, received 163 props and made 149 commits. Working on WordPress Core and other open-source projects is a high priority for me, so I ensure I have work time available to dedicate to it.

Before: Freelancer & Yoast

Before I joined Google, I was a freelancer working part-time for Yoast, who I have always admired and regarded as one of the very top companies in the WordPress space. They have an agenda that I can align with, a crazy-successful product, solid developers who are constantly improving… – I’m grateful to have been part of this wonderful team.

Not to forget, Yoast also give back to open-source a ton, they are the company that sponsored most WordPress core committers in recent years. As such, they enabled me as well to spend a significant amount of my time contributing to WordPress core.

GitHub Projects


A JavaScript-based cache solution for WordPress using the client’s local storage or, as fallback, a simple variable storage.

Language: JavaScript Stars: 25


Object cache implementation for WordPress that acts as an adapter for PSR-6 and PSR-16 caching libraries.

Language: PHP License: GPL-2.0 Stars: 21


This jQuery plugin for WordPress can be used to transform an input field into a flexible and compatible media field with attachment selection and preview.

Language: JavaScript License: GPL-2.0 Stars: 14

WordPress Plugins

Bootstrap for Contact Form 7

This plugin modifies the output of the popular Contact Form 7 plugin to be styled in compliance with themes using the Bootstrap CSS framework.

40,000+ installs Rated 96 / 100

WP Encrypt

Generate and manage SSL certificates for your WordPress sites for free with this Let's Encrypt client.

10,000+ installs Rated 80 / 100

Plugin Name: Responsive Video Shortcodes

This tiny plugin allows you to embed online video from YouTube, Vimeo and more media for a responsive layout – they scale according to the screen size …

2,000+ installs Rated 90 / 100