Worked on the vespa-engine/vespa, vespa-engine/system-test, and vespa-engine/documentation repositories, delivering eleven features and one bug fix in one month. Focused on backend development and code quality, this work included refactoring C++ code for readability, enhancing API surfaces, and improving data serialization logic. Expanded test coverage and clarified error handling to support more reliable deployments. Integrated new query construction capabilities and improved predicate handling, while updating documentation to clarify query language usage. Utilized C++, Java, and Ruby to implement these changes, emphasizing maintainability and future extensibility. The approach balanced technical polish with practical improvements to testing and documentation.