April 20, 2026 · Engineering
Observability: Logs, Metrics and Traces
When something breaks, answering 'what happened' is worth more than 'the system is slow'.
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An enterprise blog · Lanzhou · since 2019
The Jiayifangyuan Journal
What we learn, written down in public
Latest posts
126 postsApril 18, 2026 · Product Thinking
Mobile Context Decides the Interaction
Moving admin features onto phones does not start with shrinking the screen, but with understanding where users open it.
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April 16, 2026 · Project Retrospectives
Retrospective: A Regression That Slipped Through
One unrelated change brought back a bug fixed three months earlier.
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April 14, 2026 · Team and Culture
Notes on Running an Internship
Interns are not cheap labour. Train them as future colleagues and the return is surprising.
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April 12, 2026 · Industry Watch
County-Level Digitalisation: Real Needs, Different Paths
Digitalisation in county towns is a different problem from big cities.
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April 10, 2026 · Founder Notes
The Compound Interest of Reputation
A satisfied client brings the next one, provided they can explain clearly what you solved.
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April 8, 2026 · Engineering
Rate Limiting: Protect the System Before Optimising Experience
Rate limits are not there to block users, but to keep most of the system available under abnormal traffic.
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April 6, 2026 · Product Thinking
Write Product Docs for Your Future Self
Documentation is not a deliverable but team memory. Docs nobody reads are usually written for the wrong audience.
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April 4, 2026 · Project Retrospectives
Retrospective: Scaling Up the Night Before the Sale
The campaign page was load-tested, but login and coupons were what fell over.
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— The editors at JiayifangyuanEST. 2019 · JYFY