Worked on the mongodb/mongo-c-driver repository to enhance C++ forward declaration support by addressing a longstanding issue with anonymous struct typedefs in the BSON library. Introduced named structures for bson_oid_t and bson_iter_t, enabling safer and more efficient forward declarations in large C++ projects. This architectural change reduced header exposure and improved build stability for downstream consumers integrating libbson with the C driver. The work involved C++ development and software architecture skills, focusing on interoperability and maintainability. All changes were thoroughly documented with signed-off-by lines, ensuring traceability and supporting better integration practices for complex C++ codebases using BSON.