User Registration and Role Bug Fixes

I'm looking for a skilled developer to address several issues with my user registration, edit screens, and roles feature. The project entails the following tasks and requirements:

- Fixing Bugs: The user registration and edit functions are encountering errors, particularly around incorrect data validation and user information not saving properly. There's also an issue with creating the application_user_role entity. Your task is to identify and resolve all these bugs efficiently.

- Data Validation: The data validation needs to be enhanced. This includes checking for duplicate entries and null values. This is crucial for the system's stability and security.

The ideal candidate should have:
- Solid experience in debugging and fixing bugs in user registration systems
- Proficiency in Java programming and Spring Boot framework
- A good understanding of data validation and security measures
- Prior exposure to working with user roles and permissions in applications
- Excellent problem-solving skills and attention to detail

If you are confident in your abilities to tackle these issues and ensure a smoother user experience, I'd like to hear from you.