Developed a network isolation enhancement for the yuwata/systemd repository by introducing the BindNetworkInterface feature, which enables systemd units to bind sockets to specific network interfaces or VRFs. Leveraging BPF and Linux kernel development skills, the solution integrated kernel-assisted BPF hooks to enforce per-unit socket binding directly within systemd configuration. This approach improved security and policy enforcement by ensuring that network-enabled units operate within designated network boundaries, reducing cross-tenant leakage and simplifying operational management. The work demonstrated proficiency in C, network programming, and system programming, delivering a targeted solution that aligns with modern security and governance requirements for system services.