Over a two-month period, contributed to backend development across the profcomff/rating-api and profcomff/rental-api repositories, focusing on feature delivery and code maintainability. Enhanced the rating-api by adding user_fullname support to the comment system, improving user identification and discussion context, while also refactoring the Comment module and cleaning up Alembic migration files for future schema changes. In the rental-api, expanded and refactored API test coverage for item type endpoints, introducing parameterized tests and improving error handling to stabilize deployments. Leveraged Python, SQLAlchemy, and pytest throughout, emphasizing robust API development, database migration hygiene, and reliable automated testing practices.