Design, fine-tune, and optimize LLMs (LLaMA, OpenAI GPT) using LoRA and quantization; build RAG pipelines with FAISS and hybrid retrieval; develop autonomous agents with LangChain/ADK; implement ML/DL models in PyTorch and TensorFlow; build scalable APIs (FastAPI/Flask) and deploy on AWS/Azure; add guardrails, monitoring, evaluation, and performance optimization; containerize and manage deployments with Docker and Git.