Arno Uhlig developed the Nova External Scheduler API Integration for the sapcc/nova repository, focusing on enhancing scheduling flexibility in cloud environments. He implemented a new external scheduler filter that allows an external service to influence host selection after initial filtering and weighing, supporting policy-driven instance placement. Using Python and leveraging skills in API integration and backend development, Arno exposed configuration options for the external scheduler’s API URL and timeout, ensuring controlled integration. His work established a foundation for extensible scheduling policies, improved resource utilization, and contributed to SLA optimization, demonstrating depth in system design and cloud computing within a short timeframe.