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Marko Heijnen

Senior Software engineer at Jamf / CodeKitchen B.V.

@markoheijnen Groningen, The Netherlands joined Oct 2009

markoheijnen.com github.com/markoheijnen Slack: @Marko Heijnen
    Maintains XML-RPC
    Teams Core Performance Core Hosting Meta Polyglots Support
    Languages nl_NL

    Bio

    I’m a software engineer from the Netherlands, bringing over a decade of expertise to the table. Specialising in PHP, DevOps, and WordPress development, I have spearheaded numerous successful projects for global clients through my own agency. My dedication to the WordPress community dates back to 2009, where I have since then contributed to 23 versions and served as the lead developer of GlotPress from 2013 to 2015. My contributions have been instrumental in expanding WordPress’s reach across multiple languages, making GlotPress a cornerstone of its translation efforts.

    Interests

    WordPress, Kubernetes, DevOps, Beta versions

    WordPress Origin Story

    I have been using WordPress since 2006 and started contributing back to it in 2009 with my first code contribution in early 2010. In that period custom post type begin to see it’s daylight and I was more than eager to start using it. While the work just started, it also meant it wasn’t fully integrated and buggy at the time. That for me was a great place to start testing and creating patches to improve WordPress. While still being a noob around version control, with the help of the core team, I was able to start contributing back to WordPress in great ways, from core, Polyglots, localisation, Meta, community and GlotPress. In 2012 I even had commit access to the unit test repository so I could improve the test suite of WordPress directly as well.

    Badges

    CODE
    3 badges
    Core Contributor '15 Meta Contributor '15 Plugin Developer
    CONTENT
    1 badge
    Documentation Contributor '17
    COMMUNITY
    3 badges
    B BuddyPress Contributor '19 WordCamp Organizer '16 WordCamp Speaker '14
    PRACTICE
    1 badge
    Test Contributor '24
    POLYGLOTS
    2 badges
    Translation Contributor '15 Translation Editor '21

    Current Job

    Senior Software engineer
    Present
    Jamf / CodeKitchen B.V.

    Recent impact

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

    Last 30 days
    2contributions
    high2
    medium0
    score6
    Last 90 days
    2contributions
    high2
    medium0
    score6
    Last 12 months
    7contributions
    high7
    medium0
    score21

    Team focus

    Share of contributions across teams during the last 365 days

    WordPress releases

    Contributed to 22 releases
    • 6.5
    • 6.3
    • 6.1
    • 5.8
    • 5.6
    • 5.5
    • 5.3
    • 4.9
    • 4.8
    • 4.7
    • 4.5
    • 4.4
    • 4.3
    • 4.2
    • 4.1
    • 4.0
    • 3.9
    • 3.8
    • 3.7
    • 3.6
    • 3.5
    • 3.3

    Contributions

    Type
    June 2026
    Jun 11 Thu · 11:34
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    May 2026
    May 13 Wed · 06:57
    Polyglots high
    Translated 2 strings on translate.wordpress.org.
    March 2026
    Mar 04 Wed · 13:59
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    January 2026
    Jan 12 Mon · 15:14
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    December 2025
    Dec 30 Tue · 15:05
    Polyglots high
    Translated 3 strings on translate.wordpress.org.
    August 2025
    Aug 18 Mon · 09:58
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    Aug 11 Mon · 10:16
    Polyglots high
    Translated 2 strings on translate.wordpress.org.
    April 2025
    Apr 17 Thu · 07:07
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    March 2025
    Mar 03 Mon · 22:35
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    February 2025
    Feb 20 Thu · 03:20
    Polyglots high
    Translated 1 string on translate.wordpress.org.

    Developer

    Contributor

    Plugins

    Nederlands (Dutch) Plugins Translation Editor - #nl_NL

    Nederlands (Dutch) Translation Contributor - #nl_NL

    WordPress for Android, XS2Content, and WordPress 7.0.x - Development

    گؤنئی آذربایجان (South Azerbaijani) Translation Contributor - #azb

    WordPress 7.0.x - Development

    বাংলা (Bengali (Bangladesh)) Translation Contributor - #bn_BD

    WordPress 7.0.x - Development

    Cymraeg (Welsh) Translation Contributor - #cy

    WordPress 7.0.x - Development

    ગુજરાતી (Gujarati) Translation Contributor - #gu

    WordPress 7.0.x - Development

    हिन्दी (Hindi) Translation Contributor - #hi_IN

    WordPress 7.0.x - Development

    ಕನ್ನಡ (Kannada) Translation Contributor - #kn

    WordPress 7.0.x - Development

    മലയാളം (Malayalam) Translation Contributor - #ml_IN

    WordPress 7.0.x - Development

    मराठी (Marathi) Translation Contributor - #mr

    WordPress 7.0.x - Development

    سرائیکی (Saraiki) Translation Contributor - #skr

    WordPress 7.0.x - Development

    سنڌي (Sindhi) Translation Contributor - #snd

    WordPress 7.0.x - Development

    Kiswahili (Swahili) Translation Contributor - #sw

    WordPress 7.0.x - Development