{"id":126,"date":"2016-04-22T09:11:58","date_gmt":"2016-04-22T09:11:58","guid":{"rendered":"https:\/\/felix-arntz.me\/?page_id=126"},"modified":"2026-02-14T12:55:48","modified_gmt":"2026-02-14T20:55:48","slug":"home","status":"publish","type":"page","link":"https:\/\/felix-arntz.me\/","title":{"rendered":"Home"},"content":{"rendered":"\n
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Hi I’m Felix!<\/mark><\/h2>\n\n\n\n

I build software and developer tools on the web. Born in Germany, I later relocated to Zurich, then to San Francisco, and eventually to Austin, where I’m currently living.<\/p>\n\n\n\n

I work as a Senior Software Engineer at Vercel, where I am part of the AI SDK team.<\/p>\n\n\n\n

Previously, I was at Google for over 7 years, working web performance optimization for CMSs, launching the Site Kit product, and AI evals for web app coding assistance.<\/p>\n\n\n\n

I am also a WordPress Core committer, and a co-founder of the WordPress AI Team and the WordPress Performance Team. I created and maintain the PHP AI Client SDK and its WordPress-specific wrapper.<\/p>\n\n\n\n

I have both contributed to and led engineering of various open-source projects which are used by millions of people around the globe.<\/p>\n<\/div>\n\n\n\n

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\"Felix<\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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Projects I have contributed to<\/h2>\n\n\n\n
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\"AI<\/a><\/figure>\n\n\n\n
\"WordPress<\/a><\/figure>\n\n\n\n
\"PHP<\/a><\/figure>\n\n\n\n
\"Performance<\/a><\/figure>\n\n\n\n
\"Site<\/a><\/figure>\n\n\n\n
\"Gutenberg<\/a><\/figure>\n\n\n\n
\"Yoast<\/a><\/figure>\n\n\n\n
\"HTTP<\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Latest posts<\/h2>\n\n\n
\"Vercel<\/a><\/div>

A New Chapter: Joining Vercel<\/a><\/h3>
Category: <\/span>Updates<\/a><\/div>
Posted on
\"AI<\/a><\/div>

Introducing AI Code Agents: A TypeScript SDK to Solve Vendor Lock-in for Coding Agents<\/a><\/h3>
Category: <\/span>AI<\/a> Open-Source<\/a><\/div>
Posted on
\"AI<\/a><\/div>

TypeScript is the New Language of the AI Frontier, and I’m Excited<\/a><\/h3>
Category: <\/span>AI<\/a> Open-Source<\/a><\/div>
Posted on
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WordPress Core contributions<\/h2>\n\n\n\n
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I have been a WordPress Core Contributor since version 4.3 which was released in August 2015. I\u2019m currently a component maintainer of the Multisite component <\/a>and the REST API component<\/a>, but regularly work in other areas as well. With WordPress version 4.6 I was recognized as a noteworthy contributor for the first time, and since November 2016 I have been a Core Committer.<\/p>\n\n\n\n

More recently, I was the first Performance Lead as part of the WordPress 6.2 release squad, the Co-Performance Lead for the WordPress 6.3 release, and later the Performance Lead for the WordPress 6.8 release. I’m currently mostly involved in the new WordPress AI Team<\/a>, of which I am a founding member and initial co-Team Rep.<\/p>\n\n\n\n

Over the course of time I have worked on tons of tickets and made 310 commits. Working on WordPress Core and other open-source projects is a high priority for me, so I ensure I have sponsored or personal time available to dedicate to it.<\/p>\n<\/div>\n\n\n\n

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<\/use><\/svg><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Hi I’m Felix! I build software and developer tools on the web. Born in Germany, I later relocated to Zurich, then to San Francisco, and eventually to Austin, where I’m currently living. I work as a Senior Software Engineer at Vercel, where I am part of the AI SDK team. Previously, I was at Google […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-126","page","type-page","status-publish","hentry"],"yoast_head":"\nWeb Engineering and WordPress Development - felix-arntz.me<\/title>\n<meta name=\"description\" content=\"I am a full-stack web engineer, WordPress core committer and freelancer from Wuppertal, Germany, passionate about open-source and best practices.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/felix-arntz.me\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Web Engineering and WordPress Development - felix-arntz.me\" \/>\n<meta property=\"og:description\" content=\"I am a full-stack web engineer, WordPress core committer and freelancer from Wuppertal, Germany, passionate about open-source and best practices.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/felix-arntz.me\/\" \/>\n<meta property=\"og:site_name\" content=\"felix-arntz.me\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-14T20:55:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/felix-arntz.me\/wp-content\/uploads\/2025\/12\/felix-arntz-profile-2025-scaled.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"2560\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@felixarntz\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/felix-arntz.me\/\",\"url\":\"https:\/\/felix-arntz.me\/\",\"name\":\"Web Engineering and WordPress Development - felix-arntz.me\",\"isPartOf\":{\"@id\":\"https:\/\/felix-arntz.me\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/felix-arntz.me\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/felix-arntz.me\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/felix-arntz.me\/wp-content\/uploads\/2025\/12\/felix-arntz-profile-2025-1024x1024.webp\",\"datePublished\":\"2016-04-22T09:11:58+00:00\",\"dateModified\":\"2026-02-14T20:55:48+00:00\",\"description\":\"I am a full-stack web engineer, WordPress core committer and freelancer from Wuppertal, Germany, passionate about open-source and best practices.\",\"breadcrumb\":{\"@id\":\"https:\/\/felix-arntz.me\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/felix-arntz.me\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/felix-arntz.me\/#primaryimage\",\"url\":\"https:\/\/felix-arntz.me\/wp-content\/uploads\/2025\/12\/felix-arntz-profile-2025-scaled.webp\",\"contentUrl\":\"https:\/\/felix-arntz.me\/wp-content\/uploads\/2025\/12\/felix-arntz-profile-2025-scaled.webp\",\"width\":2560,\"height\":2560,\"caption\":\"Felix Arntz (2025)\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/felix-arntz.me\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/felix-arntz.me\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Home\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/felix-arntz.me\/#website\",\"url\":\"https:\/\/felix-arntz.me\/\",\"name\":\"felix-arntz.me\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/felix-arntz.me\/#\/schema\/person\/c7c3c658d2e59bbddf3e8684a6846e55\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/felix-arntz.me\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\/\/felix-arntz.me\/#\/schema\/person\/c7c3c658d2e59bbddf3e8684a6846e55\",\"name\":\"Felix\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/felix-arntz.me\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/felix-arntz.me\/wp-content\/uploads\/2018\/09\/felix-arntz-site-icon.png\",\"contentUrl\":\"https:\/\/felix-arntz.me\/wp-content\/uploads\/2018\/09\/felix-arntz-site-icon.png\",\"width\":512,\"height\":512,\"caption\":\"Felix\"},\"logo\":{\"@id\":\"https:\/\/felix-arntz.me\/#\/schema\/person\/image\/\"},\"description\":\"Developer Programs Engineer at Google. 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