We build on LangGraph, LangChain, LlamaIndex, CrewAI, and MCP for multi-agent orchestration; hosted models (GPT-4o, Claude 3.5, Gemini) and open weights (Llama 3, Qwen2.5, Mistral, DeepSeek) via vLLM and Ollama; Qdrant, Pinecone, pgvector, and BGE for retrieval; voice with Retell, Deepgram, and ElevenLabs; evals with RAGAS, DeepEval, and LangSmith. On the application layer we ship with Next.js, React, TypeScript, Tailwind CSS, Material UI, Redux Toolkit, and React Query on the frontend; Node.js (Express/NestJS), Python (FastAPI/Django), REST & GraphQL, JWT/OAuth2, RBAC, microservices, and real-time systems on the backend — plus Redis, PostgreSQL, Docker, and Kubernetes on AWS/Azure.