What is an API? What is RAG? What is a deep copy and a shallow copy? How do you handle credentials? What package is used to connect to PostgreSQL? What packages are used for web scraping? What models have you worked on so far? Explain similarity search. How will you fine-tune a model based on user queries? What package is used to run Linux commands in Python code? What is a decorator in Python? What are URLs in Django? What is a model in Django? Have you worked with LangChain, TensorFlow, and PyTorch? Explain where you have implemented them. Explain a logic to find the three largest numbers in an array without sorting. What is FastAPI? What is Flask? What are the key requirements for defining a route? How will you test an API using Postman? How will you validate the payload for an API?