Arup Chauhan developed two features across the elastic/eui and apache/solr repositories, focusing on accessibility and backend search enhancements. In elastic/eui, Arup centralized color contrast validation for Avatar and Badge UI components, refactoring duplicated logic into a shared service to improve accessibility conformance and maintainability using JavaScript and TypeScript. For apache/solr, Arup extended the KnnQParser to support multiple parent pre-filter values in nested vector queries, increasing flexibility and accuracy for parent-child data patterns in vector search. The work demonstrated depth in both front-end and backend development, emphasizing code quality, extensibility, and alignment with accessibility and search requirements.