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Vercel AI SDK with Explicit Tool Boundaries

The risky part of an AI feature is not the chat UI. The risky part is what the chat is allowed to do. It is easy to make an assistant feel powerful by giving it tools. With something like the [Vercel

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Testing Product Workflows with Vitest and Playwright

I do not want a test suite that only proves functions work. I want it to protect the workflows that would hurt if they broke. That does not mean every rule needs a browser test. Browser tests are val

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Zod, OpenAPI, and Swagger for API Contracts

A public API is not just backend code. It is a product surface for another developer. That means the contract has to be readable. It also has to be enforced at runtime. Types in the app are useful, b

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pg-boss for Durable Background Jobs

The customer problem was not "we need a queue". The problem was that a slow operation made the user wait with no clear answer. That distinction matters. A queue is an implementation detail. The produ

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Prisma and PostgreSQL as the Product Source of Truth

I do not think of PostgreSQL as only infrastructure. In a product app, it is where the product remembers what happened. That makes database design a product decision. I

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React Router for Full-Stack Product Workflows

A route is not only a URL. In a product app, a route often represents a task the user is trying to finish. That sounds obvious, but it changes how I design the code. A settings page that starts an im

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