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.

105 posts

The Two-Point Window My Trailing Stop Lives In
Quantitative TradingJun 25, 2026

The Two-Point Window My Trailing Stop Lives In

My engine runs a trailing stop to let winners run and a 5% take-profit to cap them. Read the two rules as one system and the trailing stop has a two-point window it can never leave.

The One Step I Never Hand to a Subagent
AI & AutomationJun 22, 20265 min
1

The One Step I Never Hand to a Subagent

My content routine dispatches a fleet of subagents to gather, then hands none of them the draft. A fleet parallelizes retrieval. It cannot parallelize a voice.

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The Ninety Minutes My Engine Sits Out
Quantitative TradingJun 20, 20264 min
1

The Ninety Minutes My Engine Sits Out

My stock engine refuses to open any new position after 2:30 PM ET. It surrenders the most active hour of the day on purpose. Here is the arithmetic behind the refusal.

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The Numbers I Used to Ask You to Trust
Career & Best PracticesJun 19, 20266 min
1

The Numbers I Used to Ask You to Trust

My April posts reported measured numbers you had to take on faith. My recent ones derive every figure from public config. The change was not discipline. It was topology.

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Five Up, Three Down, Even Money
Quantitative TradingJun 18, 20265 min
1

Five Up, Three Down, Even Money

My bracket risks 3% to make 5%, which reads like a favorable bet. On a price with no drift it is exactly break-even, and the reason is a theorem, not a coincidence.

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The Number My Model Is Not Allowed to Know
AI & AutomationJun 17, 20265 min
1

The Number My Model Is Not Allowed to Know

There is a rule I enforce across every agent I run, and it has nothing to do with how good the model is. The model writes the words. It never computes the numbers.

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What a Fifteen-Minute Bar Forgets
Quantitative TradingJun 16, 20265 min
1

What a Fifteen-Minute Bar Forgets

Every indicator my engine trusts is computed on fifteen-minute bars. A bar is a summary of those minutes, and the summary throws away the one thing that moved the price: the path.

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The Check That Passes Until the Day It Does Not
OpenClaw TutorialsJun 14, 20265 min
1

The Check That Passes Until the Day It Does Not

Every day my engine reconciles its own record of open positions against the broker's. Almost every day the two lists match. I do not run the check for those days.

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