Giannos focused on localization engineering, delivering complete Greek language coverage for the CollaboraOnline/online Android app and its app store descriptions. Using PO files and translation management tools, he ensured all user interface strings and marketing content were accurately translated, improving accessibility for Greek-speaking users. He also updated Greek translations for the organicmaps/website repository, maintaining consistency across web and mobile platforms. Giannos validated the end-to-end localization workflow, reinforcing maintainability and reducing the backlog of untranslated content. His work demonstrated proficiency in localization and translation, addressing discoverability and user experience challenges for Greek audiences through targeted, cross-repository language updates.