A Cloudera Impala developer works with Cloudera's open-source analytic database, Impala, which is used for performing queries and analysis on data stored in Hadoop. They design, develop, and deploy high-performance, distributed computing tasks using Impala. Their role includes writing complex SQL queries, optimizing database performance, and ensuring data security. They collaborate with data scientists and analysts to transform data into useful insights. They also participate in data modeling and design processes, and troubleshoot any issues with the database. Moreover, they stay updated with the latest developments in Hadoop and Cloudera technologies to improve data processing and analysis.