Worked on the astronomer/astronomer-cosmos repository to deliver a compatibility layer for Airflow Variables, supporting stable XCom backups across multiple Airflow versions. The solution replaced deprecated imports with a unified interface, reducing deprecation warnings and improving log clarity during WATCHER job execution. By implementing wrapper helpers in Python, the developer ensured a consistent get, set, and delete API for Variable management, minimizing code churn and aligning with SDK paths where available. Validation on large DAGs confirmed reliability and clean logs, while expanded test coverage in the backend reinforced cross-version correctness. Core skills included Airflow, backend development, and data engineering.