Build AI-platform and AI-native capabilities - the agent harness, agent building (custom agents and workflows), tool calling, retrieval, memory and context management, personalization and tone, the thread experience, and the evals that turn model quality into product quality. For agents/AI, proficiency in Python plus hands-on work building and shipping agentic systems - agent harnesses/loops, tool use, memory, and evals - not just calling LLM APIs.