
Ksenia Berezina developed and enhanced data engineering workflows for Mozilla’s docker-etl and telemetry-airflow repositories, focusing on ETL pipeline improvements and Airflow DAG development. She implemented ingestion and mapping logic for Enhanced Tracking Protection bugs, unifying them with meta bug dependencies to improve triage accuracy and reporting. In telemetry-airflow, she refactored the WebCompatKB DAG to run as a Python module and standardized CLI argument conventions, increasing maintainability and testability. When a pipeline breakage occurred, she quickly stabilized the webcompat job by debugging and applying a targeted Python fix. Her work demonstrated depth in Python development, ETL, and Airflow orchestration.

September 2025 monthly summary for mozilla/docker-etl. Focused on stabilizing the Webcompat pipeline by implementing an interim fix to the interop import in the webcompat job. This quick action preserved data processing continuity while a permanent solution is planned and evaluated.
September 2025 monthly summary for mozilla/docker-etl. Focused on stabilizing the Webcompat pipeline by implementing an interim fix to the interop import in the webcompat job. This quick action preserved data processing continuity while a permanent solution is planned and evaluated.
November 2024 — Telemetry-Airflow: WebCompatKB DAG Improvements delivered a more robust and maintainable data pipeline in the mozilla/telemetry-airflow repository. Key changes refactor the DAG to execute the main entry as a Python module for better structure and dependency management, and standardize CLI argument names by switching from underscore-separated to dash-separated flags for webcompat_kb.main. These changes reduce maintenance effort, improve testability, and align with Airflow/CLI conventions, setting the stage for future enhancements.
November 2024 — Telemetry-Airflow: WebCompatKB DAG Improvements delivered a more robust and maintainable data pipeline in the mozilla/telemetry-airflow repository. Key changes refactor the DAG to execute the main entry as a Python module for better structure and dependency management, and standardize CLI argument names by switching from underscore-separated to dash-separated flags for webcompat_kb.main. These changes reduce maintenance effort, improve testability, and align with Airflow/CLI conventions, setting the stage for future enhancements.
October 2024 monthly summary for mozilla/docker-etl. Delivered ETL enhancements to ingest Enhanced Tracking Protection (ETP) bugs and their meta bug dependencies into webcompat_kb ETL, including sample data, new relation configuration, and mapping logic to unify ETP bugs with their meta bugs. Resulted in improved accuracy of bug triage and reporting and laid groundwork for more robust ETP analytics.
October 2024 monthly summary for mozilla/docker-etl. Delivered ETL enhancements to ingest Enhanced Tracking Protection (ETP) bugs and their meta bug dependencies into webcompat_kb ETL, including sample data, new relation configuration, and mapping logic to unify ETP bugs with their meta bugs. Resulted in improved accuracy of bug triage and reporting and laid groundwork for more robust ETP analytics.
Overview of all repositories you've contributed to across your timeline