Worked on stability and correctness improvements across two major open-source repositories over a two-month period. In langchain-ai/langchainjs, addressed a bug in the Google Gemini integration by correcting MIME type handling in TypeScript, which improved the reliability of image URL processing. Later, contributed to sequelize/sequelize by fixing the Model#equals method in JavaScript and TypeScript, ensuring accurate equality checks between model instances and expanding unit test coverage to prevent regressions. Focused on backend development and unit testing, these contributions enhanced data integrity and reliability in both image handling and ORM model comparison scenarios, demonstrating attention to detail and code quality.