A LuceneSearch developer works on Apache Lucene, an open-source software library used for text-based data retrieval. They design, implement, and manage full-text search engines, ensuring high-performance and accurate querying of data. Their work includes indexing data, creating complex search algorithms, and optimizing search performance. They also handle data parsing, data analysis, and relevancy scoring. They may work on systems that require text analytics, natural language processing, or data mining. They are experts in Java, as Lucene is primarily written in this language, and must understand the nuances of search engine technology to create effective and efficient search solutions.