Sarah Chen focused on backend development for the DataDog/dd-trace-rb repository, addressing maintenance and stability of the Instrumentation Gateway. She reverted a previous experimental addition to the Gateway API, specifically removing the pushed? method and its related logic, which restored clarity and reduced the API’s surface area. Using Ruby and Ruby on Rails, Sarah updated tests and type definitions to align with the reverted changes, ensuring that no obsolete expectations remained. Her work improved code hygiene and maintainability, lowering future maintenance risk and stabilizing instrumentation behavior for downstream users. This contribution demonstrated careful attention to long-term code quality and stability.