Retrieval-Augmented Generation (RAG) · Hybrid Search & Re-ranking · LLM Evaluation (RAGAS) · Semantic Caching · Query Rewriting · Embedding Models · NLP for Bahasa Indonesia · Information Retrieval · Face Recognition (ArcFace, VGGFace) · Computer Vision · Transfer Learning (EfficientNet, MobileNetV2) · MLOps & Production Deployment · AI for Government & Public Sector