Effect for Domains at Vercel | Dillon Mulroy (Effect Days 2025)

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Dillon Mulroy discusses Effect's type-driven approach, structured concurrency, and best practices for building scalable, reliable systems in TypeScript.

00:00 Opening thanks & acknowledgments
00:48 A year ago: not yet using Effect
01:30 Intro & background
02:06 Agenda overview
02:30 The problem with TypeScript: Happy Path Blindness
05:29 TypeScript’s catch and error typing limitations
06:16 Function coloring
07:46 Fragmented ecosystem challenges
08:41 Qualities of production software
11:46 Why my team at Vercel is betting on Effect
13:00 Error typing and composability with Effect
13:52 Dependency injection in Effect
14:45 Observability & OpenTelemetry
15:23 Ecosystem harmony
16:04 Timeline of adoption inside Vercel
17:11 Self-serve domain renewals (case study)
21:02 Building the TLD metadata service with Effect (case study)
23:20 Takeaways from using Effect in production
27:04 Future plans: Cluster, Workflows, and Domain Search

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Dillon Mulroy is a Software Engineer at Vercel, with over 10 years of experience in the JavaScript & TypeScript ecosystem. He is also a regular Twitch streamer of tech content & Effect.

X(Twitter): https://x.com/dillon_mulroy
Twitch:   / dmmulroy  
GitHub: https://github.com/dmmulroy

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Effect is an ecosystem of tools to build production-grade applications in TypeScript.

Website & docs: https://effect.website/
Community & support:   / discord  
Follow us on X (Twitter):   / effectts_  
Github: https://github.com/Effect-TS

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#Effect #TypeScript #TypeScriptLibrary