Developed and delivered a Hooks Engine for Session Lifecycle within the openai/codex repository, focusing on orchestrating session start and stop events through synchronous hook execution. This system was implemented using Rust and TypeScript, leveraging full stack development skills to support new event types for hook notifications and aggregate execution results. The approach enabled blocking progression during session transitions, improving coordination and reliability of lifecycle operations. By establishing a foundation for extensible lifecycle orchestration, the work reduced risks of inconsistent states during startup and shutdown, while enhancing observability and providing a robust base for future integrations across codex components.