Modern React Patterns: Concurrent Rendering & Actions with Aurora Scharff

Aurora Scharff, Senior Consultant at Crayon, joins to break down how modern React development is evolving with features from React 18 and React 19.

She explores real-world use cases for useTransition and useOptimistic, highlights improvements in async UI rendering and performance, and shares insights on building responsive interfaces with concurrent rendering patterns.

The conversation also touches on server components, Next.js, and tools like Aria Kit and Redwood SDK, all shaping the next era of React development.

Links

Website: https://aurorascharff.no

Github: https://github.com/aurorascharff

X: https://x.com/aurorascharff

Bluesky: https://bsky.app/profile/aurorascharff.no

LinkedIn: https://www.linkedin.com/in/aurora-scharff-a86b88188

Resources

Building Reusable Components with React19 Actions: https://aurorascharff.no/posts/building-reusable-components-with-react19-actions

Chapters

00:00 Intro

00:18 Modern React concurrent rendering patterns explained

03:38 useTransition real-world examples

08:22 useOptimistic for faster UI feedback

30:10 React Server Components and Next.js integration

30:57 Building modern UIs with Aria Kit

34:07 Using Redwood SDK in the React ecosystem

39:00 Key takeaways and what’s next for React development

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