Build and architect production-grade AI systems, including LLM orchestration, retrieval layers, multi-agent workflows, tool-calling systems, and structured reasoning. Establish scalable, observable, cost-aware architecture patterns; guide data, infrastructure, API, evaluation, monitoring, and governance decisions; mentor senior engineers; and translate ambiguous business problems into reliable technical solutions. The role emphasizes hands-on building, end-to-end delivery, production reliability, and technical leadership.