"Probably my favorite thing about Effect is that it fully leverages TypeScript to the full extent of its capabilities." - Tim Smart @tim_smart (Effect Days 2025)
This Week in Effect - 2025-05-23
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: Structured Concurrency & Effect on the Frontend
- The Effect community on Discord reached 4240+ members!
- Effect featured in the Thoughtworks Technology Radar.
Here are all the technical changes from the past week.
- Escape JSON-pointers in JSONSchema.make (Bug Fix)
- Return a proxy Layer from LayerMap service (Feature, next-minor)
- Add Array.countBy (Feature, next-minor)
- Add Array.removeOption and Chunk.removeOption (Feature, next-minor)
- Config.port and Config.branded functions have been added (Feature, next-minor)
- Fix: anthropic tag name (Bug Fix)
- Fix issue with parsing file input parts in OpenAI provider (Bug Fix)
- Handle Respondable defects in toResponseOrElseDefect (Bug Fix)
- Url.setPassword supports Redacted ‘string’ values (Feaure)
- Add HttpClientRequest.toUrl (Feature)
- add HttpClient.withScope, for tying the lifetime of the request to a Scope (Feature)
- Secure Swagger UI with safe serialization and escaping (Enhancement)
This week, we published talks by Antoine Coulon and Sandro Maglione.
Antoine Coulon talked about Structured Concurrency: The hidden power behind Effect, discussing the complexities of concurrency in JavaScript and how structured concurrency in Effect provides effective solutions for managing resources and execution control.
Sandro Maglione talked about using Effect in frontend development, offering insights on when, how, and why to leverage it for real-world applications.
After last week’s Effect Cluster talk, we spoke with Tim Smart to hear his thoughts on what lies ahead for Effect.
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The 5th edition of the Effect Paris Meetup, was successfully hosted by Spiko and sponsored by Evryg on May 20th was a success, as usual! We look forward to the next one!
We start the @EffectTS_ Paris meetup #5 with @Dj3bbZ Khalid Jebbari from @EvrygDotCom talking about Effect and LLMs 🚀 Thanks to @Spiko_finance for hosting the meetup again!
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Dillon Mulroy livestreamed three episodes of his series Building a tool to sync Splitwise and YNAB with EffectTS 🚀 on his Twitch channel.
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Maxwell Brown and Tim Smart were live on X(Twitter) and Twitch on Tuesday with a new episode of Reimagining ContentLayer with Effect.
Re-Imagining Contentlayer with Effect x.com/i/broadcasts/1…
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Mattia Manzati was live on Twitch and X(Twitter) with a new episode of Building an Effect Warehouse App.
Welcome to our live show! 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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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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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