🆕 Deriving Structs With Schema v4 you reshape a struct through field-mapping helpers. Pick, omit, extend, or rename keys programmatically, the schema rebuilds itself and keeps full type inference along with mutability and optionality metadata.
This Week in Effect - 2025-07-11
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 crossed 10K Stars on GitHub 🌟.
- Durable workflows in TypeScript with
@effect/workflow. - The Effect community on Discord reached 4750+ members!
Another glimpse of Effect Schema v4 by Giulio Canti about Deriving Structs.
Here are all the technical changes from the past week.
- Remove completion helper overload from Effect.catchTag, to fix Effect.fn inference (Optimization)
- Clarify Array rotate example (Documentation Update)
- Feat: backport Layer.mock from effect-smol (Feature, next-minor)
- Add Google Generative AI Provider (Feature)
- Ensure tool call parts are properly merged when combining AiResponses (Bug Fix)
- Do not use config wrap helper for AI provider layerConfig (Optimization)
- Add discard methods to cluster EntityProxy’s (Improvement)
- Add global middleware to HttpLayerRouter (Feature)
- Make cluster shard manager options consistent between platform (Bug Fix)
- Add HttpLayerRouter.toWebHandler (Feature)
- Add HttpLayerRouter.toWebHandler example to README (Documentation Update)
- Propagate headers to HttpServerResponse.raw(Response) (Improvement)
- Update find-my-way-ts (Improvement)
- Ensure HttpApiClient schemas are composed correctly (Bug Fix)
- Fix(platform): fix KeyValueStore.make type mismatch (Bug Fix)
- Fix handling of failed streams in NodeHttpServer (Bug Fix)
- Feat(platform): add recursive option to FileSystem.watch (Feature)
- Allow RpcMessage spans to be missing (Improvement)
- Suspend parent workflows when child workflow suspends (Optimization)
- Add workflow SuspendOnFailure annotation (Feature)
- Visual Effect, a collection of interactive examples of Effect by Kit Langton. We highly recommend checking it out — it’s not only a remarkable learning tool but also a beautiful visualizer of how Effect works. ❇️
I had some fun with @EffectTS_ today. I made some visual effects, if you will, written in Effect + React.
- Building an App with Effect | #3: Resilient Layers and Building an App with Effect | #4: CRUD API by Lucas Barake
- Lets demystify Effect.gen by Harry Solovay.
Lets demystify Effect.gen. An introduction to generator functions and how/why they're used in Effect.
- Studio CMS, a headless CMS for Astro, completed its migration to Effect.
- leangpt, a new AI chat app powered by Effect, was released this week.
Introducing leangpt. Another AI chat app. Another boring wrapper 😄. Yet, different: - BYOK - Offline first and offline-only storage for now - PWA - And many more (see the thread 👇🏻) All credits to @EffectTS_: the latest and greatest 🚀. Without which, this app would not be
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Two more episodes of Implementing RFC-1035 (DNS) with EffectTS 🚀 by Dillon Mulroy.
Implementing a Feature for Effect Workflows by Maxwell Brown and Tim Smart, who were live on X(Twitter) and Twitch last Tuesday.
Implementing a Feature for Effect Workflows x.com/i/broadcasts/1…
Building an Effect-native MCP Server – Part 1 and 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 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. The job posting is available 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, a commercial real estate property management startup, 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.
Disclaimer: Please note that these job postings are shared for informational purposes, and we encourage applicants to verify details directly with the hiring companies.
In December 2024, we unveiled the Effect Merch Store with a selection of Effect-branded items designed for the community. All orders are processed 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