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Spring JPA (Java Persistence API) is used to develop robust applications that can store and manage data effectively. An expert Spring JPA developer can communicate with different databases such as MySQL and Oracle, write object-relational mappings, create relationships between data, and diagnose and execute queries to ensure the most efficient interaction with a database.

As a freelance Spring JPA developer, an expert may help a client identify their software development needs and define ideal outcomes. They can advise on the best approach for development, design databases, optimize query performance, develop data models with validations, and configure persistent engine components. They may also assist with maintenance and bug fixing tasks, update the application to meet growing requirements, perform unit tests for new features, devise problem-solving initiatives, and offer technical support.

When interviewing a potential Spring JPA developer, clients should assess their communication skills and ability to work independently as well as collaboratively. Additionally, request previous relevant experience in programming and data modeling interfaces, such as knowledge of Hibernate or JDBC. Clients should also inquire about the developer’s coding methods and their ability to work on an alternative data storage like MongoDB or Cassandra. Coding proficiency tests may be used as part of the interview process prior to hiring the most suitable candidate. Usually the average cost of hiring an expert Spring JPA developer is between $50 - $75 USD hourly depending on region and experience.

Hiring a freelancer on Freelancer.com is easy and cost-effective; therefore clients should take this opportunity to find an experienced Spring JPA specialist that can help meet their specific application development needs now!