Worked on the esrlabs/openbsw repository to address a critical bug in the IO subsystem, focusing on robust error handling for embedded systems. Improved the reliability of POSIX stdin and UART API by ensuring that the getByteFromStdin function correctly returns -1 when no bytes are read, and updated the Uart::read method to use ssize_t, preventing silent conversion of error values. This approach enhanced error detection and propagation throughout the IO stack, making it easier for callers to handle failures. The work was implemented using C++ and demonstrated strong skills in embedded systems programming and low-level error handling techniques.