Worked on the geotools/geotools repository to deliver a robust feature for handling WMS vendor parameters in Java-based backend systems. Focused on API integration and WMS protocol compliance, the work enabled propagation of vendor parameters from Layer objects into map requests for cascading WMS calls. The implementation included refactoring to detect multiple vendor parameter sets, providing warnings or defaulting to the first set to ensure consistent configuration. Enhanced feedback mechanisms were added to reduce misconfigurations and improve developer guidance. Code readability and maintainability were improved through targeted reviews, and comprehensive tests were updated to cover vendor parameters across multiple WMS layers.