Markus contributed to the nrfconnect/sdk-zephyr and nxp-upstream/zephyr repositories, focusing on embedded systems and network protocol implementation using C and YAML. He enhanced OCPP support by correcting data model misalignments and expanding hardware compatibility, notably adding M5Stack NanoC6 board support. Markus improved device identification and telemetry by implementing optional initialization parameters and refining BootNotification data transport. His work addressed memory management issues, ensuring safer string handling and reducing maintenance overhead. Throughout, he maintained strict documentation and commit traceability, demonstrating a methodical approach to standards compliance and reliability. The depth of his contributions strengthened protocol robustness and deployment stability.