Anssi Hannula contributed targeted engineering work to the OpenXiangShan/buildroot and geerlingguy/linux repositories, focusing on build system configuration and kernel-level memory management. In OpenXiangShan/buildroot, Anssi improved build reliability by ensuring NFS Utils correctly handles host dependencies when systemd is absent, stabilizing builds across diverse environments using Makefile and package management skills. In geerlingguy/linux, Anssi addressed a use-after-free vulnerability in the Xilinx CAN driver by refining memory handling in C, enhancing both stability and security for embedded Linux systems. The work demonstrated careful attention to low-level system details and a methodical approach to resolving complex, real-world software issues.