Worked on the janhq/jan repository to deliver a reasoning-tag handling upgrade that enhances model integration and UI accuracy. Developed a reasoning parser in TypeScript to support both <think> and <thought> tags, centralizing logic with a REASONING_TAG_MAP and a default tag for maintainability. Refactored the ModelFactory to reduce code duplication and streamline onboarding of future models. Expanded unit testing to cover multiple tagging conventions and regression scenarios, ensuring robust validation. Updated the front end message converter to align with new tagging standards and improved user experience by hiding model-specific tags, resulting in more consistent and maintainable UI rendering.