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Causal inference for LLM-based AI features is no longer theoretical. Airbnb, Netflix, Lyft, and Uber have published detailed engineering blog posts describing exactly how they measure the causal impac

When your AI agent serves more than one person, every tool call must answer: who's the agent acting for? Let's learn how to solve this by building an AI agent that connects with Slack and GitHub. A Sl

Today, diffusion models have become one of the most influential families of generative AI systems. They power applications ranging from image synthesis and editing to video generation, scientific disc

Sometimes you don't want to change the actual content of a PDF. You simply want to add a colored layer over part or all of the document. This can be useful for creating branded reports, adding colored

Picture this: it's 4pm on a Friday, and your team has just merged the last feature for the sprint. But your product manager asks for a new build on TestFlight by the end of the day so the client can r

PDF editing isn't limited to adding signatures or merging documents. Sometimes you simply want to improve the appearance of a PDF by increasing brightness, boosting contrast, adding blur, converting i

Your AI product shipped an agent-mode opt-in six months ago. You ran a propensity analysis, adjusted for engagement tier and query confidence, and reported a clean +8 percentage-point lift in task com

In 2022, I built a small micro-SaaS in my spare time and eventually sold it for a few thousand dollars. And today, with AI tools, it probably would've been even easier to build. But what has changed d

The gap between a demo that impresses and a system you can trust is measured in evals. I want to start with a story that's happening in hundreds of engineering teams right now. A team builds a RAG app

Systems design has always been treated as a backend problem. Ask a group of Flutter engineers what systems design means, and most will describe server architecture: load balancers, databases, and micr

Static sites are having a moment, and it makes sense. A folder of HTML, CSS, and JavaScript files is fast to load, cheap to host, and very hard to break. Tools like Astro, Eleventy, and Hugo build tha

You've spent two weeks building an AI assistant. The streaming chat looks beautiful, the system prompt is tight, and safety filters are configured. You demoed it to the team, and everyone was impresse

When a workflow has more permissions than it needs, a simple build job can become a path to repository changes, token misuse, or a wider blast radius than the team intended. The problem is easy to mis

Reading PDF documents for long periods can become tiring, especially when the document contains bright backgrounds or when you're working in a low-light environment. In other situations, designers, de