The original title is "From Software Engineer to AI Engineer - Part 1: A whole new world"

Short summary

A multi-part series guiding software engineers into AI engineering, building a real payments assistant (PayIQ) end-to-end. Covers structured outputs, tool usage, RAG, agent loops, eval suites, and injection defense using Anthropic models and LangChain. The first article establishes the operational mental model of LLMs as a simple message-in/message-out interface and performs a basic model interaction.

• •Series builds PayIQ, a payments operations AI assistant, layer by layer
• •Establishes operational mental model: LLM is f(messages) -> message, everything else is application logic
• •Uses Anthropic models with LangChain; companion repo includes all code samples

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