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Ferhat Atagün

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The failures that don't throw

The failures that don't throw

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7 min read
The second customer tells you what you actually built

The second customer tells you what you actually built

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7 min read
You're not done when it works. You're done when they can change it.

You're not done when it works. You're done when they can change it.

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7 min read
"That library will hurt performance" is not a number

"That library will hurt performance" is not a number

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7 min read
The deliverable isn't the prompt. It's the eval.

The deliverable isn't the prompt. It's the eval.

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7 min read
I accidentally built a forward-deployed engineer's field kit

I accidentally built a forward-deployed engineer's field kit

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8 min read
Nobody's model failed. The interface did.

Nobody's model failed. The interface did.

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7 min read
How I shipped a blog Google couldn't see

How I shipped a blog Google couldn't see

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9 min read
See the prompt before you ship it

See the prompt before you ship it

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7 min read
What I learned shipping four open-source Claude dev-tools in two weekends

What I learned shipping four open-source Claude dev-tools in two weekends

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8 min read
How I debug Claude agents by replaying their trace

How I debug Claude agents by replaying their trace

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7 min read
Build the sandbox before you write a single tool

Build the sandbox before you write a single tool

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7 min read
Your prompt isn't better. You just remember it being better.

Your prompt isn't better. You just remember it being better.

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7 min read
Prompt caching is the cheapest Claude optimization. Nobody measures it.

Prompt caching is the cheapest Claude optimization. Nobody measures it.

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6 min read
Building a streaming Claude client in the browser — without the SDK

Building a streaming Claude client in the browser — without the SDK

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7 min read
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