During May 2025, Odd Strålen worked on stabilizing the ESPHome integration in the home-assistant/core repository, focusing on backend development and asynchronous programming using Python. He addressed a persistent issue where ESPHome entities became unavailable after initial setup when deep sleep was enabled, ensuring entities now remain accessible and device information accurately reflects current capabilities and sleep state. Odd reinforced these changes by implementing automated unit tests to validate the new behavior and prevent regressions. His targeted bug fix and supporting tests improved the reliability and maintainability of ESPHome integration, demonstrating a thoughtful approach to backend stability and test-driven development.