David Yang, a senior engineer at PagerDuty, discusses the transition from a monolithic codebase to a microservices architecture where developers own their services, highlighting both the benefits and challenges of this shift. The new model fosters greater developer independence, reduces cycle times for addressing issues, and encourages a culture focused on eliminating roadblocks. This approach has clarified service ownership, making it easier to manage operability issues and streamline the incident response process. However, it also introduces challenges such as the need for ongoing operational maintenance and the potential for knowledge gaps, particularly with legacy systems. To address these issues, PagerDuty is focusing on leveraging KPIs and metrics to make objective decisions and balance operational work with feature development, ultimately aiming to deliver consistent customer value through collaboration and effective prioritization.