PyTorch / TensorFlow (Deep learning frameworks, CUDA optimization, distributed training); LangChain / LlamaIndex (LLM orchestration, agents, RAG chains, memory management); Hugging Face Transformers (Foundation models, tokenizers, PEFT, inference optimization); Pinecone / Weaviate / ChromaDB (Vector similarity search, embeddings, semantic retrieval); React / Next.js / React Native (React 18+, Next.js 14+, React Native, server components, streaming SSR); Flutter (Cross-platform mobile development, custom renderers, performance profiling); Backend Frameworks (FastAPI, Express, GraphQL, gRPC, WebSockets, event-driven APIs); Docker / Kubernetes (Container orchestration, service mesh (Istio), helm charts); Testing Frameworks (Pytest, Jest, Playwright, chaos engineering, contract testing);