Blog
Notes on engineering, AI and building software that ships.
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20-docs-nobody-could-find
The docs nobody could find.
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19-production-discoveries
Three things sandbox couldn't tell me about my payment SDK.
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18-always-honest
"Always honest, never assume." It's a rule I wrote at the top of my SDK's contributor guide. The origin is a small mistake that taught me something I never had…
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17-webhook-security
My SDK verifies webhooks two different ways. Most SDKs only do one.
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16-200-things-changed
200 things changed, 2 actually did.
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15-api-unification
Two API generations. Three auth methods. One client.
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14-nif-validate-locally
Validate the customer's tax ID before the network does.
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13-status-matrix
I shipped a Python SDK for a payment gateway. The page I'm most proud of is a status table.
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12-open-as-principle
An SDK is an architectural principle. Open source is a life principle.
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Async FastAPI, Measured
Everyone says async is faster. I finally ran the numbers.
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Testing FastAPI Without DB Mocks
Don't mock your database in tests.
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Pydantic + SQLAlchemy: The Real Stack
FastAPI gets the credit. Pydantic v2 and SQLAlchemy 2.0 do the heavy lifting.
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FastAPI in the Real World
FastAPI alone is a 30-line tutorial. What makes it a service is everything that wraps the framework.
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Three Sites One Admin One Postgres
Three sites, one Postgres, $8/month. That’s my Wagtail stack in production.
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Build vs buy your AI voice agent? It is the wrong question.
Tech leaders ask me a recurring question: should we buy an off-the-shelf IVR or contact-centre platform, or build a Gen-AI voice agent ourselves?
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The model choices that defined our voice agent
Following up on last week's post about the voice agent I shipped for two Pilates studios.
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I put a voice agent on the phone for a Pilates studio
A few weeks ago I shipped a voice agent that handles the phone for two Pilates studios — so the owners never had to hire a receptionist at all.
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After 15 years leading teams, I still commit every week. On purpose.
15 years ago I stopped being a full-time developer and started leading teams. 22 years into my career, I still push code every week.