JEONSEWON

I'm South korean

South KOREA Joined on Feb 20, 2026

JEONSEWON

Jul 5

I open-sourced the product that IS the business. Here's the cold logic.

#ai #buildinpublic #opensource #devtools

2 min read

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JEONSEWON

Jun 30

I opened my tool to every framework. The disciplined next move was writing zero more code.

#ai #buildinpublic #devtools #architecture

2 min read

JEONSEWON

Jun 25

I almost rewrote my engine. It was never the thing that was broken.

#ai #buildinpublic #devtools #architecture

2 min read

JEONSEWON

Jun 23

My test suite said "pass." It was lying by 19 tests.

#ai #buildinpublic #testing #devtools

2 min read

JEONSEWON

Jun 20

I almost shipped a parser that couldn't read a single real file

#ai #buildinpublic #opentelemetry #observability

2 min read

JEONSEWON

Jun 19

"Why don't you just use a better embedder?" — the most reasonable suggestion I keep refusing

#ai #buildinpublic #machinelearning #llmops

2 min read

JEONSEWON

Jun 18

The 4-step ritual I use so an AI coding agent can't hand me a green checkmark that lies

#ai #buildinpublic #devtools #llmops

2 min read

JEONSEWON

Jun 17

I spent a day teaching my tool to make the problem look smaller

#ai #buildinpublic #observability #devtools

1 min read

JEONSEWON

Jun 16

I passed all 5 of my real-AI tests. The most useful thing I found is that half my detector barely works.

#ai #buildinpublic #observability #llm

2 min read

JEONSEWON

Jun 14

"How do you build a test your detector can't game?"

#ai #machinelearning #testing #buildinpublic

1 min read

JEONSEWON

Jun 13

My AI-agent waste detector scored zero false positives. Then I ran it on a real trace.

#ai #buildinpublic #observability #llm

6 min read

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JEONSEWON

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Writing Debut

I open-sourced the product that IS the business. Here's the cold logic.

Want to connect with JEONSEWON?

I opened my tool to every framework. The disciplined next move was writing zero more code.

I almost rewrote my engine. It was never the thing that was broken.

My test suite said "pass." It was lying by 19 tests.

I almost shipped a parser that couldn't read a single real file

"Why don't you just use a better embedder?" — the most reasonable suggestion I keep refusing

The 4-step ritual I use so an AI coding agent can't hand me a green checkmark that lies

I spent a day teaching my tool to make the problem look smaller

I passed all 5 of my real-AI tests. The most useful thing I found is that half my detector barely works.

"How do you build a test your detector can't game?"

My AI-agent waste detector scored zero false positives. Then I ran it on a real trace.