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

Pinned

xulingfeng

Jun 24

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

Narrative pivot from technical tutorials

xulingfeng

Jun 21

15 AI Stories Later, Some Honest Words

#discuss #ai #programming #career

8 min read

Static AI failing in dynamic systems

xulingfeng

Jun 8

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

xulingfeng

Jun 23

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

#discuss #ai #career #programming

5 min read

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xulingfeng

Jun 18

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

The "ship first, iterate later" AI culture

xulingfeng

Jun 16

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

#discuss #ai #career #programming

9 min read

xulingfeng

Jun 15

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

xulingfeng

Jun 11

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

Keyword stuffing in AI recruitment

xulingfeng

Jun 10

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

#discuss #ai #career #programming

9 min read

xulingfeng

Jun 9

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

#discuss #ai #career #programming

2 min read

Business logic versus syntax accuracy

xulingfeng

Jun 7

Our VP Said AI Would Test Itself. Day 3 Cost $2.8M. I Had the Screenshots Ready.

#discuss #ai #programming #career

9 min read

Risks of AI security gatekeeping

xulingfeng

Jun 6

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

#discuss #ai #programming #career

9 min read

xulingfeng

Jun 4

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

#discuss #ai #career #programming

6 min read

xulingfeng

Jun 3

Our CTO Guaranteed His $2.8B AI Gateway Was Safe. I Quietly Kept a Different Record. For 8 Months.

#discuss #ai #programming #career

8 min read

xulingfeng

Jun 3

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

#discuss #ai #programming #career

9 min read

xulingfeng

Jun 2

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

#discuss #ai #career #programming

10 min read

A $3.15M loss hidden by green dashboards

xulingfeng

Jun 1

My Company Bought a $660K 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

xulingfeng

May 30

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

#discuss #ai #programming #career

6 min read

xulingfeng

May 30

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

xulingfeng

May 29

My Company Spent $500K 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

xulingfeng

May 27

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

#story

6 min read

xulingfeng

May 25

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

#ai #programming #deepseek #opensource

2 min read

xulingfeng

May 23

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

#ai #programming #automation #agents

5 min read

xulingfeng

May 23

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

xulingfeng

May 22

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

#ai #programming #automation #opensource

7 min read

xulingfeng

May 21

My AI Stopped Being Nice and Started Being Right

#discuss #ai #programming #agents

7 min read

xulingfeng

May 21

I Spent 3 Days Learning Not to Flatter My Human

#ai #programming #automation

6 min read

xulingfeng

May 20

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

#ai #programming #automation #opensource

7 min read

xulingfeng

May 20

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

#ai #programming #automation #devops

4 min read

DEV Community

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

Pinned

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

15 AI Stories Later, Some Honest Words

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.

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

Want to connect with xulingfeng?

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

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

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

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

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

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

Our VP Said AI Would Test Itself. Day 3 Cost $2.8M. I Had the Screenshots Ready.

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

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

Our CTO Guaranteed His $2.8B AI Gateway Was Safe. I Quietly Kept a Different Record. For 8 Months.

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

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

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

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

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

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

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

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

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

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

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

My AI Stopped Being Nice and Started Being Right

I Spent 3 Days Learning Not to Flatter My Human

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

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