An Apache Impala developer designs, develops, and manages big data solutions using Impala, an open-source, native analytic database for Apache Hadoop. They create high-performance, distributed systems for data analytics, write complex SQL queries, and optimize database performance. They also handle data modeling and ensure data security. Their role involves troubleshooting and resolving data processing issues, working with other developers and data scientists to integrate Impala with existing systems, and constantly updating their knowledge about the latest trends in big data technologies. They need strong skills in SQL, Hadoop, and other big data technologies.