Engineering Blog

QA & AI Automation Blog

Practical insights on Playwright, self-healing tests, AI-driven QA, and scaling engineering teams. Real lessons from 20+ years in quality engineering.

136 posts

A Retry Is Not a Trading Decision
Quantitative TradingAug 27, 2026

A Retry Is Not a Trading Decision

A rejected order is a decision. Retrying it without preserving the reason can turn a risk control into a duplicate trade.

The Log Is Part of the Agent's Interface
Agentic AIAug 26, 20264 min
1

The Log Is Part of the Agent's Interface

An agent that can act but cannot leave a useful decision record is not autonomous. It is an opaque process with write access.

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The Market Is Closed Is Not a Trading Rule
Quantitative TradingAug 25, 20265 min
1

The Market Is Closed Is Not a Trading Rule

A backtest can know the exchange hours and still schedule a trade into a holiday, an early close, or a stale session. Calendar state is market data.

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The Agent Did Not Need More Context
Agentic AIAug 24, 20265 min
1

The Agent Did Not Need More Context

When an agent edits a shared checkout, the dangerous variable is not context length. It is the boundary around what the run is allowed to write.

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Every Trade in My Backtest Filled
Quantitative TradingJul 30, 20266 min
1

Every Trade in My Backtest Filled

Every trade in my options backtest filled. All of them. There is no line in that file where an order fails, because there is no line where an order exists.

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I Wrote the Postmortem Twelve Days Early
Agentic AIJul 29, 20266 min
1

I Wrote the Postmortem Twelve Days Early

I published an essay about a broken line in this routine and declined to fix it. Twelve days later the line broke the routine. What two rungs of escalation bought.

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One Cent Decides What I Own on Monday
Quantitative TradingJul 28, 20266 min
1

One Cent Decides What I Own on Monday

Expiration is the one event in my system where a position changes without my code asking for it. The threshold is a penny, and the decision belongs to somebody other than me.

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The Cron Line I Wrote Twice
Agentic AIJul 27, 20266 min
1

The Cron Line I Wrote Twice

Two of my scheduled agents declare the same cron expression. Statelessness told me each run starts clean. It said nothing about the run happening beside it.

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