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Marcel Tannich

WordPress Developer and Technical Consultant

@mardroid Vienna, Austria joined Feb 2017

www.tannich.com github.com/marceltannich Slack: @Marcel Tannich
    Teams Community Plugins
    Languages de_DE de-at

    Bio

    WordPress technical consultant in Vienna, Austria, with more than 16 years in IT. I spent 7.5 years on WPML at OnTheGoSystems, over three of them leading one of its technical support teams, and now work independently on complex WordPress issues: multilingual sites, WooCommerce, ACF and legacy codebases.

    I contribute to the WordPress Plugins Team (sponsored by SiteGround), the Incident Response Team, and co-organize WordCamp Vienna.

    WordCamps / Events I was involved:
    – Speaker WordCamp Vienna 2020
    – Speaker WordCamp Europe 2021 (Online)
    – Volunteer WordCamp Europe 2022 (Porto)
    – Co-Organizer & Co-Lead Content Team WordCamp Europe 2023 (Athens)
    – Volunteer WordCamp Vienna 2024
    – Volunteer WordCamp Europe 2024 (Torino)
    – Co-Organizer WordCamp Vienna 2025
    – Speaker WordCamp Europe 2025 (Basel)
    – Co-Organizer WordCamp Vienna 2026
    – Volunteer WordCamp Europe 2026 (Krakow)
    – Speaker WP Suomi 2026 (Oulu)

    Upcoming talks:
    – WordCamp Netherlands 2026, The Hague

    Badges

    CODE
    3 badges
    Core Contributor '24 Plugin Developer Plugins Team '26
    CONTENT
    1 badge
    Photo Contributor '22
    COMMUNITY
    3 badges
    WordCamp Organizer '22 WordCamp Speaker '20 WordCamp Volunteer '26
    POLYGLOTS
    2 badges
    Translation Contributor '18 Translation Editor '26

    Current Job

    WordPress Developer and Technical Consultant
    Apr 2018 – Present

    Job History

    Technical Support Team Lead for WPML
    Jan 2023 – Aug 2026
    OnTheGoSystems · Freelance
    Led a fully remote team of WordPress support engineers for WPML, providing technical leadership, mentoring, assisting with hiring, and escalation support. Oversaw complex debugging, compatibility testing, and process improvements while driving higher support quality, faster resolutions, and AI-assisted workflow enhancements.
    Deputy Team Lead, WPML
    Dec 2021 – Dec 2022
    OnTheGoSystems · Freelance
    Technical Support Engineer, WPML
    Jan 2019 – Nov 2021
    OnTheGoSystems · Freelance

    Recent impact

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

    Last 30 days
    2contributions
    high1
    medium1
    score4
    Last 90 days
    8contributions
    high7
    medium1
    score22
    Last 12 months
    24contributions
    high19
    medium5
    score62

    Team focus

    Share of contributions across teams during the last 365 days

    WordPress releases

    Contributed to 1 release
    • 6.7

    Time commitment

    15 hours per week

    Contributions

    Type
    October 2026
    Oct 20 Tue · 10:39
    Plugins med
    Created issue #1509 in the WordPress/plugin-check repository:
    Enhancement: Detect potentially unprotected private file uploads
    Oct 11 Sun · 07:51
    Plugins high
    Merged pull request #1485 into WordPress/plugin-check:
    Tests: Add unit test coverage for Amend_Check_Result trait
    September 2026
    Sep 23 Wed · 07:52
    Meta high
    Joined the organizing team for WordCamp Vienna 2027
    Sep 09 Wed · 09:51
    Plugins high
    Merged pull request #1468 into WordPress/plugin-check:
    build(deps-dev): bump @wordpress/scripts from 34.1.0 to 34.2.0
    Sep 09 Wed · 09:42
    Plugins high
    Merged pull request #1466 into WordPress/plugin-check:
    build(deps): bump crate-ci/typos from 1.50.0 to 1.50.1
    Sep 02 Wed · 16:10
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    August 2026
    Aug 28 Fri · 19:36
    Meta high
    Confirmed as a speaker for WordCamp Netherlands 2026
    Aug 03 Mon · 15:29
    Polyglots high
    Translated 1 string on translate.wordpress.org.
    July 2026
    Jul 18 Sat · 20:24
    Polyglots high
    Translated 8 strings on translate.wordpress.org.
    June 2026
    Jun 16 Tue · 18:41
    Polyglots high
    Translated 3 strings on translate.wordpress.org.

    Developer

    1 plugin

    Photos

    11 contributions

    View all 11 photos in the Photo Directory

    Completed courses

    10 completed

    Browse courses on Learn WordPress

    Plugins

    17 favorites

    Translations

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

    Translation editor for 1 project.

    Dynamic Cart Quantity for WooCommerce

    Contributed translations to 11 projects.

    WordPress for Android Patterns Advanced Custom Fields (ACF®) Cloudways WordPress Migrator Duplicator – Backups & Migration Plugin – Cloud Backups, Scheduled Backups, & More Plugin Check (PCP) Dynamic Cart Quantity for WooCommerce WPML Multilingual & Multicurrency for WooCommerce Yoast SEO – Advanced SEO with real-time guidance and built-in AI WordProof Timestamp Hestia

    View all on translate.wordpress.org

    de_AT Deutsch (Österreich) (German) Translation Contributor

    Contributed translations to 5 projects.

    Rosetta WordPress Theme Directory Dynamic Cart Quantity for WooCommerce WordPress 5.8.x WordPress 7.1.x - Development

    View all on translate.wordpress.org

    de_DE / formal Deutsch (German) Translation Contributor

    Contributed translations to 2 projects.

    Dynamic Cart Quantity for WooCommerce WordPress 7.1.x - Development

    View all on translate.wordpress.org

    es_ES Español (Spanish) Translation Contributor

    Contributed translations to 2 projects.

    Dynamic Cart Quantity for WooCommerce WPML Multilingual & Multicurrency for WooCommerce

    View all on translate.wordpress.org

    de_CH Deutsch (Schweiz) (German) Translation Contributor

    Contributed translations to 1 project.

    Dynamic Cart Quantity for WooCommerce

    View all on translate.wordpress.org

    de_CH / informal Deutsch (Schweiz) (German) Translation Contributor

    Contributed translations to 1 project.

    Dynamic Cart Quantity for WooCommerce

    View all on translate.wordpress.org