A JPA (Java Persistence API) developer designs, implements, and maintains Java applications that interact with databases. They use JPA, a Java specification for accessing, persisting, and managing data, to simplify database management in Java applications. Their tasks include creating data models, writing queries, managing transactions, and ensuring data integrity. They also handle debugging, testing, and optimizing application performance. Additionally, they collaborate with other developers and stakeholders to understand requirements, design software solutions, and troubleshoot issues. Their goal is to develop efficient, scalable, and secure applications that meet business needs.