Worked on the DataDog/datadog-agent repository to address a critical issue in JSON marshaling for duration types using Go. Focused on ensuring that zero durations are serialized to valid JSON rather than nil, the solution involved modifying the MarshalJSON logic and introducing comprehensive unit tests to cover zero-duration scenarios. This backend development effort improved the reliability of serialized outputs and enhanced data integrity across metrics and logging pipelines, reducing the risk of downstream data gaps. The targeted fix not only resolved the immediate bug but also expanded test coverage, helping to prevent future regressions in duration-related serialization within the codebase.