Worked on the snowflakedb/snowflake-jdbc repository to enhance reliability and developer experience by addressing credential validation during DataSource initialization. Implemented explicit input checks in Java using JDBC, ensuring that missing usernames or passwords trigger descriptive SnowflakeSQLExceptions. This approach improved error handling by providing clear, actionable messages early in the initialization process, reducing potential support overhead and enabling faster diagnosis of misconfigurations. Added comprehensive unit tests to verify the new validation logic, increasing test coverage and code robustness. The work focused on safer initialization flows and contributed to a more predictable developer experience, emphasizing quality through targeted bug resolution and thorough testing.