I built a complete multilingual

I built a complete multilingual RAG application with Next.js voice and text controls, authentication, sessions, conversation history, streamed replies, and responsive layouts. The knowledge layer includes per-tenant document collections, hybrid keyword and vector retrieval in Elasticsearch, source citations, re-indexing when documents change, and an admin upload and test flow. LangChain coordinates prompts and memory, LlamaIndex supports indexing and citation mapping, LangGraph coordinates approved API actions and human handoff, and LangSmith supports tracing and evaluation. OpenAI GPT-4o handles generation, with Claude available as an alternate path for long-context answers.