Congkai focused on enhancing performance profiling documentation for Java applications, delivering two targeted updates across the aws/aws-graviton-getting-started and madeline-underwood/arm-learning-paths repositories. He improved the APerf documentation by integrating detailed usage instructions, updated installation steps, and clarified report generation and monitoring processes. Leveraging his expertise in Java, Linux system administration, and performance analysis, Congkai ensured the documentation reflected the latest features and provided actionable guidance for developers. His work enabled faster diagnostics and smoother onboarding for users working with APerf, demonstrating a thorough approach to technical writing and a strong understanding of performance profiling workflows in complex environments.