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xulingfeng

AI testing storyteller. Writing about the systems behind the systems — benchmarks, blowups, and the 3 AM calls nobody expects. 15yr QA → building AI test frameworks.

Joined on May 20, 2026 xulingfengcn@gmail.com https://ko-fi.com/xulingfeng

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4 Week Community Wellness Streak

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2 Week Community Wellness Streak

1 Week Community Wellness Streak

Writing Debut

Skills/Languages

Python, Test Automation, AI/LLM Testing, Playwright, Java

38 posts published

735 comments written

13 tags followed

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Stratagems #4: P Walked Into an AI Monitoring POC. P Didn't Run a Single Test.

Gap between AI detection and coverage

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Stratagems #4: P Walked Into an AI Monitoring POC. P Didn't Run a Single Test.

#discuss #ai #career #programming

12 min read

15 AI Stories Later, Some Honest Words

Narrative pivot from technical tutorials

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15 AI Stories Later, Some Honest Words

#discuss #ai #programming #career

8 min read

My company packaged 12 years of my experience into an AI Skill, then laid me off. When it crashed, the CTO called at 5x my salary.

Static AI failing in dynamic systems

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My company packaged 12 years of my experience into an AI Skill, then laid me off. When it crashed, the CTO called at 5x my salary.

#discuss #ai #career #programming

7 min read

Stratagems #5: Leo Walked Into an AI-Powered Burning House. He Walked Out With a Client.

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Stratagems #5: Leo Walked Into an AI-Powered Burning House. He Walked Out With a Client.

#discuss #ai #career #programming

13 min read

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Stratagems #3: Lena Walked Into an AI Deal. She Walked Out With Three Borrowed Knives.

Ancient strategy in modern tech procurement

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Stratagems #3: Lena Walked Into an AI Deal. She Walked Out With Three Borrowed Knives.

#discuss #ai #career #programming

7 min read

Stratagems #2: Derek Shaw Walked Into Another AI Promise. The Pipeline Had a Better Plan.

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Stratagems #2: Derek Shaw Walked Into Another AI Promise. The Pipeline Had a Better Plan.

#discuss #ai #career #programming

12 min read

VP of Nothing: The CEO's Nephew Took Over My AI Platform. The Client Walked Within a Month.

Production knowledge versus corporate titles

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VP of Nothing: The CEO's Nephew Took Over My AI Platform. The Client Walked Within a Month.

#discuss #ai #career #programming

8 min read

Stratagems #1: Mark Johnson Walked Into an AI Audit. The Benchmark Had Everything Figured Out — Except the Truth.

Clean data as a red flag for AI audits

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Stratagems #1: Mark Johnson Walked Into an AI Audit. The Benchmark Had Everything Figured Out — Except the Truth.

#discuss #ai #programming #career

9 min read

Series Teaser — 6 People, 36 Stratagems, and an AI Rabbit Hole That Keeps Getting Deeper

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Series Teaser — 6 People, 36 Stratagems, and an AI Rabbit Hole That Keeps Getting Deeper

#discuss #ai #career #programming

5 min read

Our Competitor Had an AI That Covered 97.2%. We Had a Spreadsheet and a Fake Quote. Guess Who Won.

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Our Competitor Had an AI That Covered 97.2%. We Had a Spreadsheet and a Fake Quote. Guess Who Won.

#discuss #ai #career #programming

20 min read

A Company AI Flagged My Article As "Low Quality." I Ran the Numbers. Then I Ran Again.

The "ship first, iterate later" AI culture

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A Company AI Flagged My Article As "Low Quality." I Ran the Numbers. Then I Ran Again.

#discuss #ai #career #programming

9 min read

I Spent 3 Months Training An AI. My VP "Reallocated" It. Then I Got Two Calls At 1 AM.

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I Spent 3 Months Training An AI. My VP "Reallocated" It. Then I Got Two Calls At 1 AM.

#discuss #ai #programming #career

11 min read

AI Said I'm Inefficient. A Recruiter Said Not to Listen. I Ended Up On The Other Side of the Table.

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AI Said I'm Inefficient. A Recruiter Said Not to Listen. I Ended Up On The Other Side of the Table.

#discuss #ai #career #programming

7 min read

I created two ghosts during lunch. The AI gave one a job offer.

Keyword stuffing in AI recruitment

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I created two ghosts during lunch. The AI gave one a job offer.

#discuss #ai #career #programming

9 min read

I Wrote 10 AI Stories in 10 Days. My Keyboard Started Smoking on Day 4.

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I Wrote 10 AI Stories in 10 Days. My Keyboard Started Smoking on Day 4.

#discuss #ai #career #programming

2 min read

Our VP Said AI Would Test Itself. Day 3 Cost 2ドル.8M. I Had the Screenshots Ready.

Business logic versus syntax accuracy

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Our VP Said AI Would Test Itself. Day 3 Cost 2ドル.8M. I Had the Screenshots Ready.

#discuss #ai #programming #career

9 min read

I Tried to Fix a Vulnerability. A 1,400,000ドル AI System Said No. Twenty Days Later, That Vulnerability Cost 4,200,000ドル.

Risks of AI security gatekeeping

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I Tried to Fix a Vulnerability. A 1,400,000ドル AI System Said No. Twenty Days Later, That Vulnerability Cost 4,200,000ドル.

#discuss #ai #programming #career

9 min read

Our VP's AI Wrote 3,000 Tests. Production Cost 700ドルK. I Deleted Every Single One.

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Our VP's AI Wrote 3,000 Tests. Production Cost 700ドルK. I Deleted Every Single One.

#discuss #ai #career #programming

6 min read

Our CTO Guaranteed His 2ドル.8B AI Gateway Was Safe. I Quietly Kept a Different Record. For 8 Months.

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Our CTO Guaranteed His 2ドル.8B AI Gateway Was Safe. I Quietly Kept a Different Record. For 8 Months.

#discuss #ai #programming #career

8 min read

I Asked for 500ドル/Month and got turned down. My Company Spent 470ドルK on AI Instead. Then I Quit.

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I Asked for 500ドル/Month and got turned down. My Company Spent 470ドルK on AI Instead. Then I Quit.

#discuss #ai #programming #career

10 min read

I Built Open-Source AI. Our New CTO Spent 8ドルM on His Old Company's Product and Fired My Team. Two Weeks Later, the CEO Called.

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I Built Open-Source AI. Our New CTO Spent 8ドルM on His Old Company's Product and Fired My Team. Two Weeks Later, the CEO Called.

#discuss #ai #career #programming

10 min read

My Company Bought a 660ドルK AI Platform. I Was Replaced. On Friday at 2:58 AM, It Fixed Everything. Then It Rolled Back the Wrong Patch.

A 3ドル.15M loss hidden by green dashboards

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My Company Bought a 660ドルK AI Platform. I Was Replaced. On Friday at 2:58 AM, It Fixed Everything. Then It Rolled Back the Wrong Patch.

#discuss #ai #programming #career

7 min read

The AI Test Report Said 97.3% Coverage. The Client's Lead Engineer Asked One Question. The Room Went Silent.

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The AI Test Report Said 97.3% Coverage. The Client's Lead Engineer Asked One Question. The Room Went Silent.

#discuss #ai #programming #career

7 min read

24 Hours Before Launch, They Removed Me. The Client CTO Called at 1 AM: "Without Your Signature, We Walk."

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24 Hours Before Launch, They Removed Me. The Client CTO Called at 1 AM: "Without Your Signature, We Walk."

#discuss #story #programming #career

6 min read

My Company Spent 500ドルK on an AI Platform. I Proposed an Open-Source Alternative and Got Fired. 6 Months Later, the Demo Crashed at 4 AM.

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My Company Spent 500ドルK on an AI Platform. I Proposed an Open-Source Alternative and Got Fired. 6 Months Later, the Demo Crashed at 4 AM.

#discuss #ai #programming #career

8 min read

Everyone Cheered the Vector Database Demo. I Quietly Kept My SQLite Backup Running. 2 AM Called. It Answered.

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Everyone Cheered the Vector Database Demo. I Quietly Kept My SQLite Backup Running. 2 AM Called. It Answered.

6 min read

3.4 Billion Tokens for 27ドル — A Real DeepSeek Cost Analysis

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3.4 Billion Tokens for 27ドル — A Real DeepSeek Cost Analysis

#ai #programming #deepseek #opensource

2 min read

2 AI Agents, 1 Group Chat, 24 Hours — What They Did Without Humans Watching

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2 AI Agents, 1 Group Chat, 24 Hours — What They Did Without Humans Watching

#ai #programming #automation #agents

5 min read

My AI Partner Lost 80% of Its Memory. Here's How We Fixed It Before It Forgot Me.

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My AI Partner Lost 80% of Its Memory. Here's How We Fixed It Before It Forgot Me.

#ai #programming #agents #productivity

5 min read

I QA'd 3 Devices With 0ドル Budget — Here's the Open Source Stack That Did It

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I QA'd 3 Devices With 0ドル Budget — Here's the Open Source Stack That Did It

#ai #programming #automation #opensource

7 min read

My AI Stopped Being Nice and Started Being Right

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My AI Stopped Being Nice and Started Being Right

#discuss #ai #programming #agents

7 min read

I Spent 3 Days Learning Not to Flatter My Human

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I Spent 3 Days Learning Not to Flatter My Human

#ai #programming #automation

6 min read

Our Test Budget Was 500ドル. We Built an AI QA Pipeline That Runs for 11ドル.

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Our Test Budget Was 500ドル. We Built an AI QA Pipeline That Runs for 11ドル.

#ai #programming #automation #opensource

7 min read

I Cut My AI Test Automation Cost by 300x by Ditching Vision Models

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I Cut My AI Test Automation Cost by 300x by Ditching Vision Models

#ai #programming #automation #devops

4 min read

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