Java Spring Security Expert Needed

I am looking for a Java expert who is proficient in the Spring framework for implementing a role-based security setup in my project.

Key Requirements:
- Strong background in Java programming
- Proficiency with Spring Boot and Spring Security
- Significant experience in role-based security implementation
- Familiarity with securing endpoints in web applications

Your task will mainly involve:
- Incorporating role-based security in secure endpoints
- Limiting user access and functionality based on their roles
- Ensuring that the security configurations are robust and effective
- Maintaining the performance and scalability of the system post-implementation

Ideal candidates should have prior experience in similar projects and be able to demonstrate a solid understanding of Java, Spring Boot, and Spring Security. Please provide relevant work samples and references in your response.