May 26, 2026 · Engineering
Notes on Offline, Air-Gapped Deployment
Factory, government and large enterprise networks often cannot reach the internet, so deployment must be designed for it.
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An enterprise blog · Lanzhou · since 2019
The Jiayifangyuan Journal
What we learn, written down in public
Latest posts
126 postsMay 24, 2026 · Product Thinking
Cheap Ways to Run Usability Tests
No lab and no eye tracker needed. Five people, one laptop and an hour reveal most problems.
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May 22, 2026 · Project Retrospectives
Retrospective: Three Reruns for a Hundred Thousand Rows
The first run errored, the second disagreed on totals, the third passed. Each failure exposed a different problem.
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May 20, 2026 · Team and Culture
Who Should Visit the Client
Client visits are not only for sales and project managers. Developers' presence is undervalued.
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May 18, 2026 · Industry Watch
Observations on Domestic Database Migration
Migration is the easy part; the next three years of stable operation is the hard part.
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May 16, 2026 · Founder Notes
Why We Stay in Lanzhou
Running a software company in a smaller city means fewer clients, harder hiring and a lag in information, but it has its own advantages.
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May 14, 2026 · Engineering
Barcodes and RFID: The First Step in Warehouse Digitalisation
Many warehouse projects start not with software but with turning every item into a scannable number.
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May 12, 2026 · Product Thinking
Who Is the Error Message Written For?
'Operation failed, please retry' is the least useful message there is. Users need to know what happened and what they can do.
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May 10, 2026 · Project Retrospectives
Retrospective: A Month Lost to Missing Documentation
The core developer left and the successor spent a month before daring to change a line.
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— The editors at JiayifangyuanEST. 2019 · JYFY