Application Security Enhancement with Spring

I'm looking to enhance the security of an existing application by integrating Spring Security. The primary objective of this integration is to secure the API endpoints within our business application.

Key Requirements:
- Implement Spring Security: The main task of this project is to set up Spring Security within the existing application. This should include securing our API endpoints to ensure that only authorized users can access them.
- Maintain the Existing Application: It's important that the integration is done in such a way that the existing functionalities of the application are maintained and not compromised.
- Testing and Documentation: The freelancer will be expected to thoroughly test the security measures and provide clear and comprehensive documentation of the implemented security enhancements.

Ideal Skills and Experience:
- Experience with Spring Security: The ideal candidate should have a strong background in implementing Spring Security within existing applications.
- API Security Expertise: Proven experience in securing API endpoints is a must for this project.
- Attention to Detail: Given the sensitive nature of security-related tasks, a keen eye for detail and a methodical approach to implementation is crucial.
- Documentation: The ability to provide clear and concise documentation of the implemented security measures is highly desirable.

This project is for an existing business, and as such, the security of our data and systems is of utmost importance. I'm looking for a professional and experienced freelancer who can deliver a robust security solution that aligns with our business needs.