This case study details the development and implementation of an agentic AI prototype designed to streamline HR support for a leading cloud technology provider. The objective was to create an enterprise-ready AI solution that enhances internal employee services by providing real-time support and insights. The project involved delivering a working prototype within six months, which was fully integrated at one pilot location, with plans for rollout across 40 additional sites. The case study outlines the integration of the AI agent with three internal HR and payroll platforms, and the application of secure development practices aligned with OWASP Top 10 for LLMs and DevSecOps pipelines. The initiative was driven by the need for secure integration with sensitive systems and the validation of the AI's potential to streamline HR query resolution. The approach utilized an agile, cloud-native Center of Excellence leveraging AWS AI tools, emphasizing integration, speed, and security in the development process.