Syver Haraldsen developed an observable buffered data API for flash streaming in the zephyrproject-rtos/zephyr-testing repository, focusing on enhancing the storage subsystem’s reliability and debuggability. Using C programming and embedded systems expertise, Syver designed the stream_flash_bytes_buffered API to report the number of bytes currently buffered for pending flash writes, addressing the need for improved operational insight. The implementation included comprehensive test coverage, validating scenarios such as initial buffering, partial writes, auto-flush on buffer limits, and handling oversized writes. This work demonstrated disciplined API design and robust buffer management, resulting in faster issue diagnosis and more informed decision-making for device driver development.