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Jigon Yoo

I build small reliability tools for LLM agents and pipelines — idempotency, guardrails, permission gates — and write up what actually breaks when I test them under real concurrency.

South Korea Joined on Aug 30, 2026 https://jigonyoo.com

Jigon Yoo

Oct 6

My refund handler checked the ledger before paying. It still paid twice.

#python #testing #api #ai

5 min read

Jigon Yoo

Oct 3

A unique + not_null suite stopped 3 of 17 bad batches. Here is what got through.

#dbt #dataengineering #dataquality #python

4 min read

Jigon Yoo

Oct 1

A bad batch loaded with zero errors. One row added $4.5 million.

#dataengineering #dbt #dataquality #python

5 min read

Jigon Yoo

Sep 28

A week of measuring my RL environment billed $9.01. The $10 I topped up did not cover it.

#python #ai #opensource #machinelearning

15 min read

Jigon Yoo

Sep 25

I wrote five agents to cheat my own benchmark. They found three holes. Three more found me.

#python #testing #ai #opensource

12 min read

Jigon Yoo

Aug 31

I removed every delete from my exactly-once guard. Then the bugs moved.

#python #testing #devops #opensource

7 min read

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