Worked on improving the reliability of GeoDNS IP selection in the PowerDNS/pdns repository, focusing on stability during startup and failure scenarios. Addressed a bug that caused inconsistent IP selection when all IPs were down, ensuring deterministic behavior by limiting backupSelector application to the first non-empty IP group. Adjusted the return logic so that the system now mirrors the all-up state even when every IP is down, which enhanced health-check robustness and reduced startup flakiness. Utilized C++ for backend development and network programming, applying DNS management expertise to reduce downtime and improve the uptime of GeoDNS-based routing under adverse conditions.