← Zhongquan Chengpetercheng.dev

Notes

Writing

Systems, research, and career breadcrumbs — including pieces first published on Substack. Posts live as Markdown in the site repo, versioned on GitHub, tracked for reading.

  1. Joining Deloitte in Shanghai

    Notes on the next chapter — Technology Transformation, consulting, and what I am carrying forward from engineering and research.

    1 mincareer, deloitte, shanghai

  2. Loop Engineering: How to Make an AI Coding Loop Converge

    Why your /loop keeps re-walking the same ground — and the progress-ledger discipline that fixes it

    6 minagents, systems, substack

  3. The Mom Test

    Definitely not what you think it is — a short note on asking honest questions.

    2 minproduct, notes, substack

  4. Notes from building a local-first legal AI tool on a Mac

    Lessons from shipping a local-first legal AI workflow on Apple silicon.

    10 minlocal-first, ai, substack

  5. Building a fault-tolerant LLM gateway

    What broke, what we measured, and how failover plus latency-based routing held 99.9% uptime on a real product path.

    1 minbackend, llm, systems

  6. Hello, notes

    Opening this writing space — short technical notes, career logs, and things worth keeping.

    1 minmeta