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Michal Kleiner

PROFILE

Michal Kleiner

Over twelve months, Michal contributed to the matomo-org/matomo repository by delivering 33 features and resolving 9 bugs, focusing on security, privacy, and user experience. He engineered site-specific anonymization settings, asynchronous plugin update fetching with caching, and robust notification systems for token rotation and inactive users. Michal refactored core components, optimized SQL queries, and improved test reliability, leveraging PHP, JavaScript, and Vue.js. His work included backend and frontend development, database migrations, and integration testing, consistently addressing real-world reliability and maintainability challenges. The depth of his contributions is reflected in scalable architecture, improved governance, and enhanced developer and end-user workflows.

Overall Statistics

Feature vs Bugs

79%Features

Repository Contributions

53Total
Bugs
9
Commits
53
Features
33
Lines of code
32,367
Activity Months12

Work History

October 2025

6 Commits • 3 Features

Oct 1, 2025

October 2025 monthly summary for matomo-org/matomo highlighting performance, security, privacy governance, and test-environment improvements. Delivered key features with measurable user impact and fixed critical test-setup issues. Committed changes are tied to specific commits for traceability. Overview of work: - Implemented asynchronous fetching and caching for the Plugins Update Count to prevent UI blocking and improve perceived performance; visibility gated to superusers for security; added styling hook for extra CSS classes on menu items. - Expanded privacy controls with site-specific anonymization settings, refactoring configuration and API to support per-site privacy configurations; UI and backend updated accordingly. - Cleaned up test environment configuration by removing port 80 from DDEV tests to ensure default HTTP behavior is reflected in test runs, reducing flaky tests. - Introduced policy-driven metadata reporting for settings controlled by compliance policies to improve governance over privacy configurations. Impact and value: - Faster, non-blocking UI with secure visibility rules and reduced backend load. - Finer-grained privacy controls enabling per-site data handling without broad configuration changes. - More reliable test environments and clearer policy governance, reducing risk and speeding up audits. Technologies and skills demonstrated: - Async programming, caching strategies, and feature toggles in the frontend and API layer. - Per-site configuration patterns and API refactoring for scalable privacy controls. - Test environment hygiene with DDEV configuration adjustments. - Metadata reporting for policy-driven settings to support governance and compliance needs.

September 2025

6 Commits • 5 Features

Sep 1, 2025

September 2025 monthly summary for matomo-org/matomo: Delivered a set of UX, security, data-model, and quality improvements across the dashboard, config management, and annotation subsystem, plus test stability enhancements. Key features delivered include: Dashboard Management UI Improvements; Config ID Randomization Enabled by Default with Security Check; Annotation System Refactor and DB Migration; Consolidated Token Notification Emails; Code Quality and Test Stability Improvements. Overall impact: improved user productivity, stronger security posture, robust data integrity, fewer notification spams, and more reliable releases. Technologies/skills demonstrated: PHP, database migrations, new model development, test updates (UI tests), code quality tooling (PHPCS trailing comma rule), dependency management (UI test dependencies).

August 2025

4 Commits • 4 Features

Aug 1, 2025

August 2025 focused on delivering four high-impact features and infra improvements for matomo-org/matomo, delivering security, reliability, and developer productivity gains while reducing noise in testing and builds. Highlights include a new Inactive User Notifications feature (admin alerts for inactive users, a new enablement setting, last_seen data migrated to the user table for efficiency, and a scheduled task for security notifications, along with code simplifications and UI test updates), test environment hardening to ignore dynamically created local static sites during browser testing, a code quality improvement enforcing ESLint rules to prevent problematic imports from vue/src and ensuring aliased imports resolve reliably, and enhancements to the Multi-language Email Invitations to send invite acceptance notifications in the inviter’s language with an integration test. Impact includes improved security and visibility for inactive users, more reliable test environments and builds, and a better end-user and developer experience through language-aware communications and stricter code standards.

July 2025

4 Commits • 3 Features

Jul 1, 2025

July 2025 performance summary for matomo-org/matomo: Delivered high-impact features, resolved a critical site search reporting bug, enhanced security and data quality, and improved query performance and component reusability. These work items collectively improve analytics accuracy for customers, data integrity, and developer productivity, while reinforcing the product's UX and performance profile.

June 2025

6 Commits • 4 Features

Jun 1, 2025

June 2025 monthly summary: Delivered targeted UX improvements and maintainability upgrades across matomo and tag-manager repos. Resulted in stronger security posture, improved user experience, and more robust test coverage, with codebase cleanups reducing future risk.

May 2025

3 Commits • 2 Features

May 1, 2025

In May 2025, delivered key features and fixes for matomo to improve branding experience, reliability, and security. Highlights include a publish-on-save branding workflow with temporary uploads and cleanup, a robustness improvement to URL hostname detection, a security-conscious logging configuration, and updated tests to validate these changes.

April 2025

4 Commits • 2 Features

Apr 1, 2025

April 2025 monthly summary — matomo-org/matomo Key features delivered: - User Token Rotation Notification System: adds configurable per-user rotation reminder period, tracks last notified timestamps, and automatically schedules and sends email reminders when rotation is due; fixes email content to correctly display rotation period days. Commits: 191d36dd5eb1dcedd41bbfdfd63fa1cdaaaf015d; 98d13e5bb47cf779444abcc6f27bb9a8d1f8552b. - Archive System Improvements: makes blob archive compression level configurable (0-9); optimizes archive loading by caching in ArchiveLoader::canSkipThisArchive; includes tests. Commits: ed3cde5cbc8f4076971baa0fe82a2d9c52a280a3; 93b8ef355ce783ee5d4f9a617de6e81b009836f5. Major bugs fixed: - Fixed missing number of days in the rotation email content (#23224). Commit: 98d13e5bb47cf779444abcc6f27bb9a8d1f8552b. - Performance improvements in archiving: added caching in ArchiveLoader::canSkipThisArchive to reduce redundant work (#23216). Commit: 93b8ef355ce783ee5d4f9a617de6e81b009836f5. Overall impact and accomplishments: - Strengthened security posture with timely, per-user token rotation reminders; improved reliability and performance of the archiving workflow; added tests to reinforce quality and stability. Technologies/skills demonstrated: - PHP/Matra codebase familiarity, per-user notification pipelines, email templating and content correctness, configuration-driven features, caching strategies, and test-driven development.

March 2025

7 Commits • 4 Features

Mar 1, 2025

March 2025: Delivered a mix of user-facing UX improvements, security hardening, and maintainability updates for Matomo. The work improved reliability, reduced risk in production, and clarified critical authentication behaviors for end users, while stabilizing tests and internal workflows.

February 2025

3 Commits • 2 Features

Feb 1, 2025

February 2025 highlights for matomo-org/matomo: - Privacy enhancement: added a backend setting to randomize the configuration ID on a per-tracking-request basis, with UI controls gated behind a feature flag and associated tests. - Archiving robustness: introduced an additional validation to ensure archiving does not get skipped under edge cases, refining invalidation handling for array-based reports and certain period types to improve reliability. - Developer experience: added DDEV project configuration and setup scripts to enable local development and testing workflows, with accompanying docs.

January 2025

3 Commits • 1 Features

Jan 1, 2025

January 2025 focused on delivering business value through user-facing UI improvements and backend simplification in matomo. Implemented Data Table UI Enhancements to improve report usability and interaction, and removed the PDO MySQL adapter's prepared statements cache to reduce complexity and fix related issues. Updated UI tests and Vue builds to reflect these changes, ensuring stability and faster onboarding for users and developers.

December 2024

2 Commits • 1 Features

Dec 1, 2024

December 2024 performance: Delivered two high-impact deliverables that improve attribution accuracy and settings reliability, with strong test coverage and practical business value.

November 2024

5 Commits • 2 Features

Nov 1, 2024

November 2024 (matomo-org/matomo): Delivered key features focused on authentication security UX and dashboard UI enhancements. Implemented Authentication and Security UX Improvements with email alert for cross-country logins, secure handling of password fields on modal close, session reload after new session creation to prevent stale permissions, and 2FA flow improvements via a dedicated modal. Also rolled out All Websites Dashboard UI/UX Enhancements, moving the AWD date picker to the top controls, layout refinements, and updated UI test artifacts for better clarity. These changes reduce security risk, improve admin workflows, and contribute to a smoother cross-site administration experience.

Activity

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Quality Metrics

Correctness93.4%
Maintainability92.2%
Architecture88.4%
Performance85.6%
AI Usage20.8%

Skills & Technologies

Programming Languages

BashCSSDockerfileGit IgnoreHTMLJavaScriptLessMarkdownN/APHP

Technical Skills

API DesignAPI DevelopmentAsynchronous OperationsBackend DevelopmentBuild Process OptimizationCSSCSS/LessCachingCaching StrategiesCode CleanupCode LintingCode QualityCode RefactoringCoding StandardsCompliance Management

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

matomo-org/matomo

Nov 2024 Oct 2025
12 Months active

Languages Used

JavaScriptLessPHPTwigTypeScriptVueCSSBash

Technical Skills

Backend DevelopmentEmail NotificationsFront End DevelopmentFrontend DevelopmentInternationalizationJavaScript

matomo-org/tag-manager

Jun 2025 Jun 2025
1 Month active

Languages Used

CSS

Technical Skills

CSSFront End Development

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