## Interview 1 — Technical Discussion - **Cost optimization** — Escalation ladder architecture, assertion-gated routing, blended cost reduction of 66% - **Graph RAG** — Hybrid vector + knowledge graph traversal, entity-relationship modeling for product intelligence - **Agents vs Tools** — Tools execute, agents reason and decide - **Multi-Agent + HITL** — Orchestrator → Specialists → Aggregator → Validation → Human Checkpoint - **Agent Evaluation** — Step, trajectory, outcome levels. RAGAS + LangSmith + custom harness - **Chunking** — Document: semantic/section-aware. API-based: field projection + reranking + token budgeting - **Cloud Deployment** — Containerization → Registry → Serverless → Secrets → Persistent Vector Store migration - **Transformer** — Positional encoding, multi-head attention, masking, cross-attention, LayerNorm, KV cache --- ## Interview 2 — System Design - **Large scale API architecture** — Domain-driven: routing layer, service layer, schema contracts, shared DI clients, async, versioned