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🏗️ System Architecture ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ Frontend │ │ Backend API │ │ Langflow │ │ (React/Vue) │◄──►│ (FastAPI/Flask)│◄──►│ (LLM Chain) │ │ │ │ │ │ │ │ • User Input │ │ • Job Scraping │ │ • Question Gen │ │ • Video Record │ │ • Data Pipeline │ │ • Grading Logic │ │ • 3D Avatar │ │ • API Gateway │ │ • Tips Gen │ └─────────────────┘ └─────────────────┘ └─────────────────┘ │ │ │ │ │ │ ▼ ▼ ▼ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ Digital Ocean │ │ Twelve Labs │ │ External APIs │ │ │ │ │ │ │ │ • App Hosting │ │ • Video Analysis│ │ • Job Scraping │ │ • Database │ │ • Sentiment │ │ • TTS/STT │ │ • File Storage │ │ • Body Language │ │ • 3D Avatar │ └─────────────────┘ └─────────────────┘ └─────────────────┘ 🔧 Tech Stack Frontend:

React/Vue.js for UI WebRTC for video recording Ready Player Me / VRM for 3D avatars Web Speech API for voice interaction

Backend:

FastAPI (Python) for API PostgreSQL for data storage Redis for caching Celery for background tasks

AI/ML:

Langflow for LLM orchestration Twelve Labs for video analysis OpenAI/Anthropic for LLM processing ElevenLabs/Azure for TTS

Infrastructure:

Digital Ocean Droplets Digital Ocean Spaces (S3-compatible storage) Docker for containerization

📁 Project Structure ai-interview-platform/ ├── frontend/ │ ├── src/ │ │ ├── components/ │ │ ├── pages/ │ │ ├── hooks/ │ │ └── utils/ │ ├── package.json │ └── Dockerfile ├── backend/ │ ├── app/ │ │ ├── api/ │ │ ├── core/ │ │ ├── models/ │ │ ├── services/ │ │ └── utils/ │ ├── requirements.txt │ └── Dockerfile ├── langflow/ │ ├── flows/ │ └── components/ ├── docker-compose.yml └── deploy/ ├── nginx.conf └── docker-compose.prod.yml

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