Big update coming for the @EffectTS_ AI SDK 🎉 More flexibility. Better ergonomics. More power for the end-user. Details → github.com/Effect-TS/effe…
This Week in Effect - 2025-09-19
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 AI SDK Release.
- Durable workflows in TypeScript with
@effect/workflow- currently in alpha. - The Effect community on Discord reached 5290+ members!
- Effect crossed 11K Stars on GitHub 🌟.
Effect AI SDK is out! More flexibility. Better ergonomics. More power for the end-user.
Here are all the technical changes from the past week.
- Refactor the Effect AI SDKs (Feature, Refactor, Optimization)
- Feat: added allowed tools (Feature, next-minor)
- Add an Effect AI SDK provider integration package for OpenRouter (Feature, Bug Fix)
- Fix conversion of anyOf json schema to openapi schema (Bug Fix)
- Don’t remove entities from map on shutdown (Bug Fix)
- Ensure ShardManager and Runner get fresh versions of the rpc protocol (Bug Fix)
- Ensure runner detects when it has been externally unregistered (Bug Fix)
- Re-add two phase runner health check (Improvement)
- Backport active shard latch changes from effect 4 (Feature)
- Add onOpen option to Socket.run (Feature)
- Improve SqlMessageStorage insert queries (Improvement)
- Backport ClusterWorkflowEngine partial entity clients (Improvement)
- Attempt to prevent InterruptedException leaks into entity replies (Bug Fix)
- Catch interruptions in Sharding storage loop (Improvement)
- Add onOpen option to Socket.run (Feature)
- Add onOpen option to Socket.run (Feature)
- Attempt to prevent InterruptedException leaks into entity replies (Bug Fix)
- Fix the instructions for calling an RPC in the RPC readme (Documentation Update)
Event-Driven Systems in FinTech: How Spiko Leverages Effect
This episode features Samuel Briole, CTO of Spiko, a Paris-based FinTech startup building infrastructure for issuing regulated financial products on public blockchains, specifically risk-free products.
Spiko utilizes Effect extensively, from day one, for both backend and frontend development, particularly for managing asynchronous operations, API integrations, and smart contracts.
Cause & Effect features stories from software engineers and companies that use 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.
The Cause & Effect podcast is hosted by Johannes Schickling and available on YouTube, X(Twitter), and audio platforms like Spotify and Apple Podcast.
- Mattia Manzati, Effect Core Contributor & Founding Engineer at Effectful Technologies, presented Effect at SquiggleConf, a conference for web tooling in Boston.
Learning about Effect at @SquiggleConf
- The first Effect Nice Meetup 🇫🇷 is happening on October 23rd, organized by Hugo Muffraggi and the À ton dev association. The event will be in French.
- Designing Production Agent Systems with Effect, a book by Ryan Hunter.
Replying to @ryanjhunter everything drops today. spec: github.com/artimath/agien… books: theryanhunter.com code: github.com/artimath/agien… cartographer of complexity → mapped it agency amplifier → built it benevolent horseman → riding it tsunami surfboards → here's yours let's build the future
printify-effect, a TypeScript library that wraps the Printify REST API using Effect patterns and provides a type-safe, functional interface for interacting with Printify’s print-on-demand services. By Michael Lorton.
@effect-ak/aws-sdk, a library that generates Effect wrappers for the AWS SDK in TypeScript, making errors explicitly typed for operations like uploading to S3. By Aleksandr Kondaurov.
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…
Building a CLI Application With Effect is now on our YouTube Channel.
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 customer, 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. -
PhosPhor is hiring engineers experienced in Effect. You may also reach out to the Phosphor team on [our Discord(https://discord.com/channels/795981131316985866/796153351372275743/1418407399139578067).
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