Ryosuke Iwanaga, President of OpsBR Software Technology Inc., shares his extensive knowledge on software architecture and maintenance. He discusses the importance of single-threaded ownership for better software maintenance and the evolving strategies to manage technical debt in legacy systems. Ryosuke emphasizes effective change management and the benefits of phased rollouts with feature flags. He dives into cell-based architecture, exploring its scalability and reliability, while also addressing the need for operational excellence through automation and monitoring.