Made a presentation to talk about AI agents and showed ledda.ai to the crowd Couldn't miss the change to make some @EffectTS_ propaganda as well
This Week in Effect - 2025-09-12
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.
- Durable workflows in TypeScript with
@effect/workflow- currently in alpha. - Effect AI integration packages,
@effect/ai- currently in alpha. - The Effect community on Discord reached 5280+ members!
- Effect crossed 11K Stars on GitHub 🌟.
Here are all the technical changes from the past week.
- Docs: fix JSDoc content for Predicate.isNumber to match the implementation (Documentation Update)
- Ensure finish part is emitted by anthropic when streaming (Bug Fix)
- Fix: Fixes the total token count (Bug Fix)
- Feat: added allowed tools (Feature, next-minor)
- Ensure defects don’t cause loops in ClusterCron (Bug Fix)
- Fix multiple persisted requests subscribing to the same id (Bug Fix)
- Add Workflow.poll api (Feature)
- Fix traceFlags propagation when set to 0 (Bug Fix)
- Add suffix option to FileSystem.makeTempFile (Feature)
- Provide http span to global middleware (Improvement)
- Suspend workflow execution to ensure defects don’t escape (Bug Fix)
- Add Workflow.poll api (Feature)
- Return executionId from Workflow.execute + discard (Improvement)
- Maxwell Brown, Effect Core Contributor, presented Effect on the official AWS Developers channel. Together with James Ward, Principal Developer Advocate at Amazon, Maxwell showed how to create reliable AI agents using TypeScript, Effect, and Amazon Bedrock, covering error handling, tool integration, schemas, MCP server implementation, and more.
- Foldkit, a lightweight framework for building functional UIs in TypeScript built with Effect by Devin Jameson.
- In a recent post on X, Afonso Matos went through the challenges of building their SaaS, Arvow, and how Effect helped them build more resilient and maintainable software, simplifying error handling, workflows, and stability where everything used to break.
- Congrats to Marcelo Bairros for presenting Ledda.ai and never missing the chance to spread the word about Effect!
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@effect-native/crsql, an Effect Service with@effect/sqlprepared statements for working with the cr-sqlite extension, was released this week by Tom Aylott. -
@parischap/conversions,@parischap/pretty-print,@parischap/ansi-stylesby Jérôme Martin.
Maxwell Brown and Tim Smart were live on X and Twitch as they continue their work on ChEffect.
Working on ChEffect - A Local-First Meal Planning App written with Effect x.com/i/broadcasts/1…
In his latest tutorial, Mattia Manzati shows how Effect Layers make complex dependencies more manageable!
Any real world application has a complex tree of dependencies. @EffectTS_ Layers keep them manageable… and with this, they become even nicer! Learn how 👇
Rewriting Effect’s CLI is now 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 fourth episode with Dillon Mulroy, Domains Lead at Vercel, who shares his own journey with Effect and how Vercel gradually adopted it across their Domains platform. Dillon explains why Effect feels like having superpowers for error handling, observability, testing, and more!
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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Heartbeat: Senior Software Engineer
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spring.new, Anthropic’s flagship costumer, is hiring engineers experienced in Effect. See the job posting in the
#job-boardchannel on our Discord. -
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