An opinion and methodologies on how to modernize an outdated and unmaintained codebase while at the same time delivering features. We will also explore how AI can support modernizing a legacy codebase.

An opinion and methodologies on how to modernize an outdated and unmaintained codebase while at the same time delivering features.[+] We will also explore how AI can support modernizing a legacy codebase.

Tests are code, too, but they don't get as much attention, often leaving messy, hard to understand tests. Poorly factored tests can also make refactoring production code more difficult, resulting in even messier code.

In this session, we'll start with what we need from a good test, using AssertJ and JUnit features to make it readable and maintainable. We'll walk up the ladder from Helper methods, shared Factory Methods, all the way to Test Data Builders, discussing how and when to make the transition between them. We'll look at test "smells" and how to repair them, using Parameterized Tests. If time allows, we'll see how to "retarget" your tests when extracting a new production class from existing code.

While the code is in Java, the principles and techniques apply to most languages.

GraphQL celebrated it's 10 year birthday last year, today it's PostGraphile's turn! Hear from maintainer Benjie about the origins of the project, the lessons learned along the way, and how the project has evolved to meet the needs of its users despite being MIT-licensed OSS.

Next.js is a great framework - until you want to deploy it somewhere that isn't Vercel. vinext is a Vite plugin from Cloudflare that reimplements the Next.js API surface from scratch, so your existing app runs everywhere with a single command. In this talk, we'll look at why this exists, how Cloudflare built it in a week using AI, and how close to "drop-in replacement" it actually gets.

Why meditation and programming are a perfect match.

A practical guide to internationalization pitfalls in React. From tricky pluralization (especially in Czech) to parameter handling and translation key misuse, this talk shares lessons that go beyond basic i18n setup.

Why performance monitoring should be continuous—not occasional. This talk covers how to track FPS, CPU, and memory usage effectively and why it matters for building smooth applications.

A look at building real-time fintech dashboards using Next.js, TypeScript, and React Server Components. Learn how to handle high-frequency data, apply optimistic updates, and leverage streaming with Suspense to deliver fast, responsive UIs.

We built a real-time system for Postgres→React sync using a `LISTEN/NOTIFY` Postgres trigger, GraphQL `@live` queries, a React hook and a custom ORM-inspired GraphQL query builder. Starting from ESP32 microcontroller devices sending MQTT messages and a Node/Postgres backend, we moved from polling to a stand-alone PoC with Yoga, Prisma triggers, and a custom `useLiveQuery` hook. After proving that the PoC was working we integrated with all our existing full-stack apps. So now we have low-latency UI updates, reusable cross-app logic, and easier extension for new sensor values. Great UX and excellent DX.