Kirill Zabelin focused on enhancing the reliability of the modem subsystem in the balena-os/balena-generic repository, addressing a kernel panic that occurred during Cinterion ALAS5 modem initialization. By identifying and patching a race condition in the Linux MBIM driver, Kirill stabilized the initialization process, which improved device uptime and reduced field failures related to cellular connectivity. The work involved advanced kernel-level debugging and patching in C, demonstrating strong skills in driver development and embedded systems. The solution was integrated with minimal deployment risk and clear traceability, resulting in fewer support tickets and more reliable connectivity for balena-generic deployments.