🧪 Smarter Unions The engine now discards union members that are obviously wrong, so error reports stay focused.
This Week in Effect - 2025-07-25
Hi Effecters!
Welcome back to This Week In Effect (TWIE) - your weekly update of the latest developments in the Effect community and ecosystem.
Effect is a powerful TypeScript library that helps developers create complex, synchronous, and asynchronous programs. One key feature that sets Effect apart is how it leverages structured concurrency to provide features such as async cancellation and safe resource management, making it easier to build robust, scalable, and efficient programs.
To get started, below you’ll find links to our documentation as well as our guide for installing Effect. Enjoy!
Recent major updates:
- Effect 3.17 Release.
- Effect crossed 10K Stars on GitHub 🌟.
- Durable workflows in TypeScript with
@effect/workflow. - The Effect community on Discord reached 4900+ members!
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Effect 3.17 has been released!
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More upcoming Schema v4 features by Giulio Canti: how Unions will become smarter.
Here are all the technical changes from the past week (note that changes included in the 3.17 release will not be listed).
- Fix: service test “promises” use case (Bug Fix)
- Copy over apply, bind, call into service proxy (Bug Fix)
- Clarify Tuple length requirements (Documentation Update)
- Remove recursion from Sink fold loop (Bug Fix)
- Fix Layer.mock dual detection (Bug Fix)
- Expose the AiChat history Ref (Improvement)
- Add “scale” option to OpenAI service tier (Bug Fix)
- Fix: properly form otlp urls (Bug Fix)
- Fix problematic prompt pasting (Bug Fix)
- Add RpcClientError (Feature)
- Don’t capture non-suspended interrupts in Workflow.intoResult (Bug Fix)
- Track the Cause for workflow SuspendOnFailure (Improvement)
- Feat: add resume endpoint to WorkflowProxy (Feature)
- Michael Fester showcased the Effect RPC + TanStack Query setup he’s using at 14.ai.
A powerful combo: Effect RPC + TanStack Query. A year ago, during his internship with us, @ethanniser implemented (among a bunch of other amazing things!) an @EffectTS_ wrapper around @tan_stack Query. We haven't looked back since. It's handling queries and mutations in a fully
- Effect CLI is Awesome | Building a Git AI Assistant by Lucas Barake
- Ethan Niser updated Effect by Example with How to use Effect
HttpApiwith Next.js.
Now on Effect by Example: How to use Effect `HttpApi` with Next.js
- Ethan is also working on a streaming hydration support for effect rx
its happening... streaming hydration support for effect rx
- StudioCMS shared their recent migration to Effect, Beta 19, an Effectful Update, where they went over all the changes.
- Another Effect Playground by Kishore, this time with trace visualization.
Finally here 🚀 Effect playground with trace visualisation. This is extremely helpful to understand how Effect works. Even more exciting stuff soon 😄. Stay tuned. Play at: kishore.app/effect/playgro… @EffectTS_
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One more episode of Implementing RFC-1035 (DNS) with EffectTS 🚀 and two more of Experimenting with EffectTS, S3, and Vercel by Dillon Mulroy on his Twitch channel.
Maxwell Brown and Kit Langton were live on X and Twitch with Building a GitHub Action with Effect and Building a CLI Application With Effect.
Building a GitHub Action with Effect x.com/i/broadcasts/1…
Building a CLI Application With Effect x.com/i/broadcasts/1…
Building a Local-First Application with Effect and Livestore (Part 2) by Maxwell Brown and Tim Smart – live on X(Twitter) and Twitch last Tuesday.
Working on a Local-First Web App with Effect x.com/i/broadcasts/1…
Building an Effect-native MCP Server – Part 3 and Effect Development - Building an Effect API Provider Integration for Google (Part 2) have been published on our YouTube Channel.
Don’t forget to listen to our Cause & Effect podcast hosted by Johannes Schickling and available on Youtube, X(Twitter), and audio platforms like Spotify and Apple Podcast.
This podcast highlights stories from software engineers and companies using Effect in production. Each episode explores their journey of adopting Effect, including the learning process, challenges faced, and benefits of integrating Effect into their tech stack.
We’ve published our third episode with David Golightly from MasterClass about how his team built Cortex – a real-time voice AI orchestration layer that powers personalized conversations with celebrity instructors like Gordon Ramsay and Mark Cuban
More and more companies are adopting Effect in their projects. Here’s a list of companies looking for software engineers with Effect experience:
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Expand.ai: Founding Engineer
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Platonic Systems: Remote Effect Engineers
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Medbill.ai: Founding Software Engineers (full-stack and backend)
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Oneiro Solutions: Software Engineer - Core Team. Join Effect Discord and DM leighman for further info.
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Microsub: TS Developer
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Samsung Food: Full Stack Developer
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Margins: Product Engineer
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Precurion looking for a remote‑first Founding Engineer with Effect experience – See the job posting in the
#job-boardchannel on our Discord. -
Vitalize Care is hiring a full-stack engineer with Effect experience: Full-Stack Engineer
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Embedded Insurance is hiring for a Senior Software Engineering position.
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Betalyra, an AI consulting company from Portugal, is looking for a part-time freelance software engineer (TypeScript/Effect) with AI experience – see the job posting in the
#job-boardchannel on our Discord. -
Software Intelligence Works: Senior Full-Stack Engineer
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14.ai: Founding engineer
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Wander is hiring Software Developers with experience in Effect.
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Stealth team looking for a software engineer with Effect experience – see the job posting in the
#job-boardchannel on our Discord. -
A French-speaking startup team led by Stephan Le Dorze is looking for a freelancer to join them - see his LinkedIn post for more details.
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Freckle.io is hiring Platform Engineers with experience in Effect.
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A stealth team that has already scaled their product to 50K daily active users in the last year, is looking for Effect Developers. DM wireless on X for more info.
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Job opening for Japanese-speaking developers
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Globe Commerce: Founding Product Engineer
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Introw: Staff Software Engineer
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ManageSpace is looking for a Senior Developer to mentor other developers and migrate to Effect – see the job posting in the
#job-boardchannel on our Discord. -
coteach.ai is looking for a Software Engineer – see the job posting in the
#job-boardchannel on our Discord and DM Peter Edmonds for further info. -
Small SaaS team is looking for a part-time Effect Developer to implement Effect in their stack. The job posting is available in the
#job-boardchannel on our Discord, DM jonpage for further info.
Disclaimer: Please note that these job postings are shared for informational purposes, and we encourage applicants to verify details directly with the hiring companies.
The Effect Merch Store offers a selection of Effect-branded items designed for the community. All orders are processed and fully managed through Printful.
Effect Merch is here! We’re excited to announce the launch of our Effect merch page! Grab your favorite swag & show your love for Effect in style! 🧢 effect.website/merch
That’s all for this week. Thank you for being a vital part of our community. Your feedback is highly valued as we fine-tune this format. Feel free to share your thoughts, and we’ll do our best to tailor it to the needs of our community.
Effect Community Team