We need an experienced Siemens NX developer to develop a custom add-in that connects the CAD environment to Leo AI. The goal is to enable engineers to call Leo services directly from NX. For example, they can push model data, receive processed results, and reflect results within a session without leaving the software. The following capabilities are required: • Compiled add-in and full source code that can be loaded into the latest NX releases (12, 1899, 1953). • Seamless authentication and API bridge between NX and Leo AI, including error handling and logging. • Context-aware commands that trigger Leo AI calls from the NX ribbon or right-click menu. • Clean, maintainable code with comments and simple setup guides, allowing our team to expand upon it in the future. If you have any previous examples of NX Open, C++, C#, or Python-based plugins (especially those that call external REST or gRPC services), please share them with your bid. To prevent bot bidding, please write ADD-IN at the top of your bid.