July 1, 2026 · Engineering
Data Migration: Understand the Old Ledger First
Migrations rarely fail on technology. They fail because nobody can describe what the legacy data actually contains.
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An enterprise blog · Lanzhou · since 2019
The Jiayifangyuan Journal
What we learn, written down in public
Latest posts
126 postsJune 29, 2026 · Product Thinking
Positioning an AI Feature
Treating a large model as a universal assistant usually produces features nobody uses. Start from a specific task.
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June 27, 2026 · Project Retrospectives
Retrospective: The Cost of Vague Acceptance Criteria
The system was finished and the client said it was not what they wanted. Every argument returned to one line: it was never specified.
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June 25, 2026 · Team and Culture
A Knowledge Base Is a Habit
A knowledge base does not get used because it exists. It exists when every problem starts there.
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June 23, 2026 · Industry Watch
Digital Fault Lines in Supply Chains
Every company has its own systems; connecting them is where the gaps appear.
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June 21, 2026 · Founder Notes
Where a Small Company's Brand Comes From
Without an ad budget, a brand is built by every delivery, every email and every problem taken seriously.
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June 19, 2026 · Engineering
What to Test When the Budget Is Tight
Without a dedicated QA team you still need a strategy. Spend the limited effort where failures cost the most.
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June 17, 2026 · Product Thinking
Designing Pricing Tiers
Tiers are not random feature buckets. They should let a client recognise which one they belong to.
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June 15, 2026 · Project Retrospectives
Incident Review: Running Out of Database Connections
The system went down at nine on a Monday morning because one connection was never closed.
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— The editors at JiayifangyuanEST. 2019 · JYFY