Worked on the zephyrproject-rtos/mcuboot repository to address a critical cross-toolchain compatibility issue affecting embedded systems built with C. Focused on compiler compatibility, the developer implemented a conditional STRUCT_PACKED macro in image.h to ensure correct struct packing when using the IAR compiler. This technical approach eliminated a portability risk that could have led to data corruption or misinterpretation of firmware image headers. The solution was validated across multiple toolchains, reducing risk for customers relying on IAR. Comprehensive documentation and commit traceability were provided, supporting future maintenance and audits while strengthening the reliability of firmware deployments in embedded environments.