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Writing

Notes from building products and writing code — product thinking, engineering retros and working with AI.

2026

  1. 2026-11-08Product

    One official key, many subsidiaries — how to share it safely

    A group had one key for a third-party data service and several subsidiaries that needed it. Instead of handing it out, I put a gateway in front. Notes on the trade-offs.

    2 min read · API gateway / Key management / B2B

  2. 2026-11-03Engineering

    Five API-gateway pitfalls that look right and quietly lie to you

    What these bugs share — everything runs, the UI looks fine and the numbers are there. They are just wrong. All from an audit of my own project.

    2 min read · API gateway / Observability / Retrospective

  3. 2026-10-20AI

    Shipping a mini-program MVP in three weeks — what I cut

    A mini program for field engineers, from signed-off requirements to a working release in about three weeks. It was fast because it was small, not because it was rushed.

    1 min read · MVP / Mini program / Claude

2023

  1. 2023-07-01Product

    How to deliver a product well — the Xiaopai implementation handbook

    The handbook I wrote for new implementation consultants at Xiaopai — what the job really is, three real customer post-mortems, and what to deliver at every step from kickoff to sign-off.

    18 min read · Delivery / Implementation / MES

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