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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

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

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

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

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

If you've ever built a web application or configured Spring Security, you've almost certainly encountered Cross-Site Request Forgery (CSRF). In my previous guide, How OAuth 2.0 Works: A Practical Guid

I still remember the first time I ran a Bell-state circuit on a quantum simulator. The code was only a few lines long, but it felt magical. Two qubits became entangled, and the simulator returned almo