@EffectTS_ 3.16 has been released! - New ExecutionPlan module, for building fallback scenarios when dealing with flaky services - Effect.Service parameter support - Access Schedule information for more fine-grained retry logic And more! effect.website/blog/releases/…
This Week in Effect - 2025-05-30
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 Days 2025 talks: MasterClass’ AI Voice Chat & Effect for AWS Lambda
- The Effect community on Discord reached 4240+ members!
- Effect featured in the Thoughtworks Technology Radar.
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Effect 3.16 has been released!
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Getting started with Effect’s AI integrations is now easier than ever, just
Effect.providethe model you want to use, and you’re all set! -
Mattia Manzati brought some quality-of-life improvements this week with a new
Effect.genandEffect.fnautocomplete.Little quality of life improvement to the @EffectTS_ language service: Autocomplete Effect.gen and Effect.fn!
Here are all the technical changes from the past week (note that changes included in the 3.16 release will not be listed).
- Fix(Metric): summary min max values when no samples (Bug Fix)
- Fix Effect.fn inference in case of use with pipe functions (Bug Fix)
- Effect.fn: fix type inference for Effect subtypes (Bug Fix)
- Escape JSON Schema $id for empty struct (Bug Fix)
- Adjust ExecutionPlan provides & requirements types (Bug Fix)
- Relax Schema.brand constraint (Bug Fix)
- Add HashMap.countBy (Feature, next-minor)
- Fix AiToolkit handlers type extraction (Bug Fix)
- Fix missing encoding of path parameters in HttpApiClient (Bug Fix)
- Update /platform dependencies (Optimization)
- Fix package internal imports (Bug Fix)
- Refactor PlatformError and make it a schema (Refactor)
- Escape JSON Schema $id for empty struct (Bug Fix)
- Decode HttpApiClient response from ArrayBuffer (Bug Fix)
- Fix array buffer slice in HttpApiClient (Bug Fix)
This week, we published talks by David Golightly and Victor Korzunin.
David Golightly shared how he built On Call, MasterClass’ real-time AI voice chat, using Effect, focusing on Cortex, the orchestration layer, and how Effect helped with error handling, structured streaming, and observability in a complex async architecture.
In his post-conference interview, David shared the reasons he decided to build MasterClass’ AI voice chat with Effect.
"The spaghetti code really turns into something that's just very linear and clean, and it really promotes excellent software architecture." David Golightly shares how Effect powers a real-time AI voice chat system at @masterclass
Victor Korzunin talked about Effect for AWS Lambda, its integration, benefits, and future prospects to make serverless programming more efficient.
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Dillon Mulroy livestreamed two episodes of his series Building a tool to sync Splitwise and YNAB with EffectTS 🚀 on his Twitch channel.
- Maxwell Brown and Tim Smart were live on X(Twitter) and Twitch on Tuesday with a new episode of Building an Effect-native MCP Server.
Building an Effect-native MCP Server x.com/i/broadcasts/1…
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 second episode with Michael Fester from Markprompt about scaling AI-powered customer support with Effect, building reliable and high-performance infrastructure, and enhancing developer productivity in a fast-evolving AI landscape. Let us know your thoughts on our social media or Discord!
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. The job posting is available in the
#job-boardchannel on our Discord. -
Vitalize is hiring a full-stack engineer with Effect experience: Senior 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. The job posting is available in the
#job-boardchannel on our Discord. -
Stealth team looking for a software engineer with Effect experience. The job posting is available in the
#job-boardchannel on our Discord. -
Stephan Le Dorze is looking for a French-speaking freelancer to join him in a small team in a startup - see his LinkedIn post for more details.
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