In February 2025, Ivan Vlaserg focused on improving the reliability of DBT model selection within the astronomer/astronomer-cosmos repository. He addressed a bug where model names containing periods were not correctly matched by custom selectors, implementing a solution that replaces periods with underscores in node names prior to matching. Ivan reinforced this fix by expanding test coverage to include edge cases, ensuring regression protection and deployment correctness. His work demonstrated a strong command of Python development, data engineering, and test-driven practices, resulting in more robust DBT workflows and reducing the risk of incorrect model inclusion or exclusion during deployment processes.