JianguoDing
EN

Jianguo DingSoftware Engineer

Knowing the definitionisn’t the same as understanding.

Here I keep the questions I’ve followed further: put back into concrete situations, compared and tested, and made into something others can check and take further.

Start with the index

Index

Something you’ve heard of but never quite understood?

Financein Chinese

AI / RAGin Chinese

Series

Each series follows one question down: from a first intuition to something you can check.

  1. Finance

    From its first P&L to its first M&A, what counter-intuitive problems does a small business run into?

    Experiments
    4 scenario experimentsBusiness decisions in a made-up shop
    Practice
    Cash ReviewA working paper on ICHIBANYA’s real FY2026 filings
    Go to the Finance series in Chinese
    Figure · Finance 02 · Scenario 2 · Orders keep growing

  2. AI / RAG

    Why does a RAG system still answer wrong when it found the right documents?

    Experience
    The Paper Room · the basic game
    Topic
    RAG 02 · Chunkingin Chinese
    Go to the RAG series
    Figure · The Paper Room

Projects

Products and systems I’ve built, each starting from a concrete problem.

  • GoodIdea

    For people about to build a product with AI

    Problem
    The idea isn’t clear yet, and AI is already writing the code.
    What I built
    A product definition agent: AI roles for research, design and engineering raise their concerns first, you make the key trade-offs, and the result is a first scope and handoff package a coding agent can start from.
    Today
    The public site has a demo on a fixed example; the workspace isn’t open yet.

  • Forge

    For teams maintaining existing systems

    Problem
    Your coding agent can finish the change. Should it also make the product decisions nobody approved?
    What I built
    Before a coding agent changes an existing codebase, surface what it shouldn’t decide on its own, and let people decide first.
    Today
    A real case on Spring PetClinic and one baseline evaluation are public; the code is on GitHub.