Notes from the build

Traces not appearing in the Langfuse dashboard after setting up OpenTelemetry? Here's exactly what's wrong with the SDK setup and how to fix it — with working config included.

Why client-side PDF parsing, image conversion, and data extraction is a mistake at scale — and how to move it to server-side APIs for faster performance, protected business logic, and a smoother user experience.

The TypeScript patterns that keep large codebases maintainable — discriminated unions for state machines, branded types for domain safety, and module boundary patterns that prevent spaghetti imports.

The API security mistakes that get apps breached — and exactly how to fix them. Covers JWT auth, OAuth flows, rate limiting strategies, and input validation with real code examples.

How to add live chat, real-time notifications, and collaborative features using WebSockets — from raw implementation to production-ready patterns with Next.js App Router.

The indexing mistakes that kill performance at scale — and how to fix slow queries without rewriting your schema. Covers PostgreSQL patterns and strategies for high-traffic production applications.

A direct comparison of Flutter, React Native, and native iOS/Android — performance benchmarks, developer experience, team size fit, and when each one is the right call for your project.

How to build a production AI app using Next.js 15 and the Vercel AI SDK — with real-time streaming responses, server-side tool calls, and structured JSON outputs. Includes working code for each pattern.