
Thomas Zilliox contributed to Matomo’s matomo-org/matomo and matomo-org/tag-manager repositories by delivering user-facing features such as segment management with star/unstar capabilities, dark mode UI updates, and refreshed documentation with synchronized screenshots. He stabilized UI screenshot tests across year boundaries and improved CI reliability by aligning test cases with evolving UI states. Using JavaScript, PHP, and Vue.js, Thomas enhanced accessibility, reduced test flakiness, and optimized build processes. His work included debugging race conditions, refining error handling, and maintaining design consistency across modules. These efforts resulted in more reliable releases, improved onboarding, and a smoother user experience for both end users and developers.
April 2026 monthly summary for matomo-org/tag-manager: Delivered the Dark Mode UI Design Update, updating UI screenshots to reflect the new dark mode design and ensuring visual consistency with the product design system. The change was implemented in commit 1960420d5cea700eb234c9b8a8fc7917557b721b, linked to issue #1086 for traceability. This work enhances usability in low-light contexts and supports the roadmap for broader user adoption.
April 2026 monthly summary for matomo-org/tag-manager: Delivered the Dark Mode UI Design Update, updating UI screenshots to reflect the new dark mode design and ensuring visual consistency with the product design system. The change was implemented in commit 1960420d5cea700eb234c9b8a8fc7917557b721b, linked to issue #1086 for traceability. This work enhances usability in low-light contexts and supports the roadmap for broader user adoption.
March 2026 monthly summary for matomo-org/matomo and matomo-org/tag-manager focusing on delivering customer-facing features, stabilizing test infrastructure, and improving developer productivity. Key outcomes include a new Segment Management Page, build and test stability improvements, faster local debugging capabilities, and cross-repo quality enhancements. These efforts reduce release risk and accelerate iteration cycles.
March 2026 monthly summary for matomo-org/matomo and matomo-org/tag-manager focusing on delivering customer-facing features, stabilizing test infrastructure, and improving developer productivity. Key outcomes include a new Segment Management Page, build and test stability improvements, faster local debugging capabilities, and cross-repo quality enhancements. These efforts reduce release risk and accelerate iteration cycles.
February 2026 monthly summary for matomo-org/matomo: Stabilized UI screenshot tests by fixing reliability issues and aligning test expectations with the current UI state. Updated test cases and underlying UI components to reduce flakiness, improving CI reliability and feedback speed on UI changes. Commit 0d99a319789182f11a4a3067452353a08c6bca48 (Fix UI screenshot tests (#24067)).
February 2026 monthly summary for matomo-org/matomo: Stabilized UI screenshot tests by fixing reliability issues and aligning test expectations with the current UI state. Updated test cases and underlying UI components to reduce flakiness, improving CI reliability and feedback speed on UI changes. Commit 0d99a319789182f11a4a3067452353a08c6bca48 (Fix UI screenshot tests (#24067)).
2026-01 — matomo-org/matomo: Stabilized UI screenshot tests around the New Year transition to eliminate flakiness and ensure consistent visuals across year boundary. Implemented fix in commit f9facf45df114dd7bf4848190a5fde54f0727318 (Fix new year UI screenshot tests, #23937). Impact: more deterministic UI test results, faster feedback to UI regressions, reduced maintenance overhead in CI pipelines. Technologies: automated UI validation, CI pipelines, cross-year boundary testing, and collaboration with QA. Business value: higher release confidence and lower risk from flaky UI tests affecting production readiness.
2026-01 — matomo-org/matomo: Stabilized UI screenshot tests around the New Year transition to eliminate flakiness and ensure consistent visuals across year boundary. Implemented fix in commit f9facf45df114dd7bf4848190a5fde54f0727318 (Fix new year UI screenshot tests, #23937). Impact: more deterministic UI test results, faster feedback to UI regressions, reduced maintenance overhead in CI pipelines. Technologies: automated UI validation, CI pipelines, cross-year boundary testing, and collaboration with QA. Business value: higher release confidence and lower risk from flaky UI tests affecting production readiness.
December 2025: Delivered Segment Management: Star/Unstar Stored Segments in Matomo (commit dd29cb201989560be2607f5de05fe429a8a5b810) with micro-animations, permission-aware tooltips, and accessibility improvements for all segment actions. Fixed segment search race condition and clean handling of special characters to ensure reliable query results. Enhanced the presentation of the segment list/actions for anonymous users to improve usability and clarity.
December 2025: Delivered Segment Management: Star/Unstar Stored Segments in Matomo (commit dd29cb201989560be2607f5de05fe429a8a5b810) with micro-animations, permission-aware tooltips, and accessibility improvements for all segment actions. Fixed segment search race condition and clean handling of special characters to ensure reliable query results. Enhanced the presentation of the segment list/actions for anonymous users to improve usability and clarity.
Month: 2025-11 — Developer performance summary highlighting delivered features, bug fixes, and overall impact with a focus on business value, quality of UI documentation, and cross-repo consistency.
Month: 2025-11 — Developer performance summary highlighting delivered features, bug fixes, and overall impact with a focus on business value, quality of UI documentation, and cross-repo consistency.
Month 2025-10 summary: In matomo-org/tag-manager, delivered UI Design Refresh with documentation updates and performed a Non-modal Screenshot Change regression fix. The UI refresh included four commits updating UI screenshots to reflect the latest design and keeping docs in sync, improving visual consistency and onboarding. The regression fix rolled back non-modal screenshot changes to restore prior behavior. Impact: higher user confidence, smoother onboarding, and preserved functionality after design changes. Technologies demonstrated: frontend UI/UX design, documentation discipline, regression testing, and robust Git-based workflows with clear, traceable commits (UX-287 updates and rollback).
Month 2025-10 summary: In matomo-org/tag-manager, delivered UI Design Refresh with documentation updates and performed a Non-modal Screenshot Change regression fix. The UI refresh included four commits updating UI screenshots to reflect the latest design and keeping docs in sync, improving visual consistency and onboarding. The regression fix rolled back non-modal screenshot changes to restore prior behavior. Impact: higher user confidence, smoother onboarding, and preserved functionality after design changes. Technologies demonstrated: frontend UI/UX design, documentation discipline, regression testing, and robust Git-based workflows with clear, traceable commits (UX-287 updates and rollback).

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