Enis Simsek developed BGP IPv4-only session support for the LabNConsulting/frr repository, enabling IPv4-based BGP sessions to establish even when IPv6 addresses are not configured in mixed IPv4/IPv6 environments. By introducing logic to handle startup-order edge cases, Enis ensured that IPv4 sessions could reliably come up before IPv6 configuration, reducing manual intervention and downtime in dual-stack deployments. The work demonstrated proficiency in C and Python, with a focus on network programming, BGP protocol handling, and system configuration. This feature improved interoperability and deployment flexibility for users migrating to IPv6 while maintaining robust IPv4 coexistence in production networks.