Worked on the Backbase/openapi-tools repository to enhance the quality and correctness of generated API models. Focused on template engineering and code generation using Java and Mustache, the developer addressed a longstanding issue by removing the deprecated no-argument constructor from the POJO template. This change enforced the use of constructors with required arguments, aligning generated code more closely with actual API usage and reducing the risk of incorrect initialization. The update improved the maintainability and stability of the OpenAPI tooling, ensuring that client code generation is safer and more predictable. The work demonstrated careful attention to API contract enforcement and template clarity.