During August 2025, Piotr Kotowski developed foundational callback infrastructure for chat model events in the RobotecAI/rai repository, focusing on Streamlit integration. He implemented the on_chat_model_start callback as a placeholder, establishing a clear path for future event-driven chat customization. Using Python and leveraging backend development and API integration skills, Piotr ensured the callback mechanism aligned with repository conventions to support maintainability and extensibility. Although the work was limited to a single feature, it laid essential groundwork for future enhancements, enabling more flexible chat user experiences in Streamlit deployments and simplifying the addition of new event-driven features as requirements evolve.