Worked on the spring-projects/spring-ai repository to enhance encapsulation within the OpenAiChatModel by restricting the visibility of the internalCall method from public to private. This targeted change in Java improved backend API boundaries, reducing the risk of unintended external usage and supporting safer future refactoring. The update was delivered through a focused commit with clear documentation, aligning with established code governance and maintainability practices. By tightening access control, the work contributed to greater API safety for downstream consumers and facilitated ongoing development of the OpenAI integration, demonstrating attention to robust backend development and adherence to contribution standards.