Worked on the cocoindex-io/cocoindex repository to address cross-version compatibility issues in NumPy ndarray unpickling, focusing on environments with varying NumPy and Torch versions. Delivered a targeted backend patch in Python that registers the _frombuffer method under both NumPy 1.x and 2.x pickle key paths, ensuring robust data serialization and deserialization. This change mitigated unpickling failures and runtime errors in data interchange workflows, making the serialization process version-agnostic for numpy ndarrays. The work demonstrated a strong grasp of NumPy internals and backend development, with clear, auditable changes that improve long-term maintainability and compatibility for downstream consumers.