Project Title: Build a Real-Time AI Avatar Role-Play Platform (LiveKit + HeyGen + OpenAI RAG) Project Description: The Goal: We are building SkillDose, a premium training platform for pharmaceutical sales representatives. We need a Senior Full-Stack AI Engineer to develop a high-fidelity MVP where users can practice sales pitches via voice with an interactive, hyper-realistic AI Avatar acting as a doctor. The Core Challenge: The interaction must be real-time (<800ms latency) and feel natural. The avatar must listen, "think" based on a closed knowledge base (PDFs), and respond with synchronized lip-sync video. Required Architecture (Non-Negotiable): We are looking for a developer with proven experience implementing the LiveKit Agents Framework. Orchestrator: LiveKit Agents (Python or Node.js) to handle the real-time pipeline. Visual Avatar: Integration with HeyGen Interactive Avatar SDK (via LiveKit plugin). Intelligence (Brain): OpenAI GPT-4o connected to a Vector Database (Pinecone/Milvus) for RAG (Retrieval-Augmented Generation). The avatar must only use provided medical documents to answer. Voice Pipeline: Deepgram (STT) and ElevenLabs (TTS) optimized for low latency. Key Features to Build: Real-Time Voice Conversation: Users speak naturally; the avatar responds instantly. Barge-In Capability: If the user interrupts the avatar, the avatar must stop speaking immediately (handled via LiveKit). Semantic Evaluation Logic: A background agent must analyze the user's speech and score it against a "Correct Answer" rubric (not keyword matching, but semantic meaning). Persona Implementation: Configure one specific avatar persona ("Dr. Skeptic") with a strict personality and objection-handling logic defined in our prompt system. Deliverables: A functional Web App (React/Next.js) with the Avatar interface. Backend infrastructure set up (LiveKit Server + Agents). Integration of 1 Medical Product PDF (Knowledge Base). Source code documentation and deployment guide. Ideal Candidate: You have built Voice AI Agents before using LiveKit. You understand WebSockets and WebRTC nuances. You have experience with RAG pipelines (LangChain/LlamaIndex) to prevent AI hallucinations. Bonus: Previous experience with HeyGen or Synthesia APIs. Skills Required (Selecciona estas etiquetas): Artificial Intelligence (AI) Python (or Node.js) OpenAI API React.js VoIP / WebRTC