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Matthias Pfefferle

Open Web Lead at Automattic

@pfefferle Karlsruhe, Germany joined Dec 2006

notiz.blog github.com/pfefferle Slack: @pfefferle
    Languages de_DE

    Bio

    A fullstack developer, blogger, podcaster, OpenWeb advocate, citizen of the IndieWeb, working on ActivityPub and IndieWeb for WordPress!

    Interests

    IndieWeb, Fediverse, ActivityPub, Open Web, Microformats, Webstandards, biking, Home Automation, IoT

    WordPress Origin Story

    – In 2002 I installed my first blog using the WordPress predecessor b2.
    – 2004 I switched to WordPress.
    – I worked on my first theme in 2006 and my first plugin in 2007.
    – I uploaded a first theme (SemPress) to WordPress.org in 2011.
    – Two years later, SemPress was added to the WordPress.com theme directory by Automattic.
    – 2015 was my first “Core Contribution” (OEmbed).
    – I held my first WordCamp talk in 2016.
    – I held my first WordPress Meetup talk in 2019.
    – Started working on ActivityPub for WordPress in 2019
    – 2023 I joined Automattic to work full time on the OpenWeb/Fediverse

    https://notiz.blog/2018/06/19/15-jahre-wordpress/
    https://notiz.blog/2023/06/02/20-jahre/

    Badges

    CODE
    7 badges
    Core Contributor '15 Hosting Contributor '20 Hosting Team '20 Meta Contributor '20 Plugin Developer Theme Developer WP-CLI Contributor '24
    CONTENT
    1 badge
    Photo Contributor '22
    COMMUNITY
    3 badges
    Meetup Organizer '24 WordCamp Organizer '24 WordCamp Speaker '16
    PRACTICE
    1 badge
    Support Contributor '26
    POLYGLOTS
    2 badges
    Translation Contributor '15 Translation Editor '15

    Current Job

    Open Web Lead
    Apr 2023 – Present
    Automattic
    I work on open, portable, interoperable, small, social, synaptic, semantic, structured, distributed, (re-)decentralized, independent, microformatted and federated social web stuff.

    Job History

    Head of WordPress Development
    Mar 2020 – Mar 2023
    IONOS · Full-time
    Established a WordPress development team, conducted development and performance reviews, and actively supported the personal growth of team members. Led the technical development of various PHP and WordPress projects, served as the liaison between teams and departments, and contributed to the design of agile processes. Acted as a sponsored member of the WordPress Hosting Community and initiated and managed IONOS's involvement in WordPress.org's "Five for the Future" program.

    Recent impact

    Score weights high-impact work (commits, releases, approved translations, props) at 3x routine activity.

    Last 30 days
    19contributions
    high0
    medium19
    score19
    Last 90 days
    98contributions
    high0
    medium98
    score98
    Last 12 months
    314contributions
    high5
    medium309
    score324

    WordPress releases

    Contributed to 5 releases
    • 6.9
    • 6.8
    • 5.6
    • 5.5
    • 4.4

    Contributions

    Type
    June 2026
    Jun 14 Sun · 06:26
    Forums med
    Posted a reply to Activitypub: Author URL “(…)?author=1” not accessible, on the site WordPress.org Forums:
    @jeroenleenders this has nothing to do with the permalinks, it seems that you hoster blocks…
    Jun 12 Fri · 14:17
    Forums med
    Posted a reply to not see follower request, on the site WordPress.org Forums:
    Hey @camaran 👋 do you have any kind of security plugin installed, that might block…
    Jun 09 Tue · 20:35
    Forums med
    Posted a reply to Critical WordPress error crashes sites, on the site WordPress.org Forums:
    but you mention PHP 8.1.x in your initial report!? It is that PHP below 8.2…
    Jun 09 Tue · 13:54
    Forums med
    Posted a reply to Push single post, on the site WordPress.org Forums:
    I improved the connection handling in 1.1.1 and had no disconnect since then! Can you…
    Jun 09 Tue · 13:36
    Forums med
    Posted a reply to Critical WordPress error crashes sites, on the site WordPress.org Forums:
    Hey @earl_d 👋 this is because the plugin has PHP 8.2 as min requirement 🫣
    Jun 05 Fri · 21:39
    Forums med
    Posted a reply to Follow activity reverts from ‘Unfollow’ to ‘Confirm Request’, on the site WordPress.org Forums:
    Thanks for the logs, the issue should be fixed with: https://github.com/Automattic/wordpress-activitypub/pull/3372
    Jun 05 Fri · 08:16
    Forums med
    Posted a reply to Follow activity reverts from ‘Unfollow’ to ‘Confirm Request’, on the site WordPress.org Forums:
    @whatwhere can activate that snippet for your blog, start a follow process and share the…
    Jun 04 Thu · 06:55
    Forums med
    Posted a reply to Push single post, on the site WordPress.org Forums:
    (I will also check why your blog lost connection... This should not happen at a…
    Jun 04 Thu · 06:54
    Forums med
    Posted a reply to Push single post, on the site WordPress.org Forums:
    Hey @seindal 👋 Good point! Would you expect something in the wp-admin UI or is…
    Jun 02 Tue · 10:07
    Forums med
    Posted a reply to Blocked user’s deleted posts cause reply loop in moderation queue, on the site WordPress.org Forums:
    We released the fix with version 1.1.1. Let us know if you still experience any…

    Developer

    18 plugins

    Contributor

    8 plugins

    Themes

    2 themes

    Photos

    2 contributions

    View all 2 photos in the Photo Directory

    Completed courses

    3 completed

    Browse courses on Learn WordPress

    Plugins

    52 favorites

    Themes

    5 favorites

    Translations

    3 locales
    de_DE Deutsch (German) Plugins Translation Editor Translation Contributor

    Translation editor for 17 projects.

    ActivityPub ActivityStream extension host-meta Hum ID4me IndieAuth IndieWeb IndieWeb Press This MF2 Feeds NodeInfo(2) Open Search Open Graph WebSub (FKA. PubSubHubbub) SubToMe WebFinger Webmention Microformats 2

    Contributed translations to 8 projects.

    ActivityPub ID4me WebSub (FKA. PubSubHubbub) Semantic-Linkbacks Auto Updater Webmention SemPress WordPress 7.0.x - Development

    View all on translate.wordpress.org

    de_DE / formal Deutsch (German) Translation Contributor

    Contributed translations to 2 projects.

    BuddyPress WebSub (FKA. PubSubHubbub)

    View all on translate.wordpress.org

    en_NZ English (New Zealand) (English) Translation Contributor

    Contributed translations to 1 project.

    Auto Updater

    View all on translate.wordpress.org