Gawoon Choi contributed to the BerriAI/litellm repository by developing a configurable image preview feature for the Gemini-3-Pro model, enabling users to specify image sizes for generated previews. Using Python and leveraging skills in API and backend development, Gawoon implemented the imageSize parameter, updated model identifiers, and ensured robust test coverage and documentation. In a separate effort, Gawoon addressed a credential injection bug affecting video status and content endpoints with wildcard model patterns, introducing a more reliable model-name resolution strategy. The work demonstrated depth in backend reliability and image processing, resulting in improved developer experience and reduced production troubleshooting.