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:
- We started publishing the talks from Effect Days 2025!
- The Effect community on Discord reached 4040+ members!
- Effect featured in the Thoughtworks Technology Radar.
Technology
Here are all the technical changes from this week.
Effect Core
- Fix(Metric): summary quantile values (Bug Fix)
- Make Match.valueTags dual (Feature)
Effect Cluster
- Tighten cluster health checks to improve worst case recovery time (Improvement)
- Attempt to use network for persisted messages where possible (Feature)
- Reset shard last_read on acquistion (Improvement)
Effect Opentelemetry
- Update otel peer dependencies to ^2.0.0 (Feature)
Effect RPC
- Improve RpcServer schema defects (Improvement)
Community Highlights
Zach Warunek, Software Engineer at X.com, just posted about adding Effect TS to the 𝕏 codebase!
Andrew M released Synchrotron an offline-first data sync library with Effect and PGlite, that allows for unrestricted offline database operations while still guaranteeing eventual consistency, all without requiring dedicated conflict resolution code.
Mattia Manzati, is working on some Effect Dev Tools (more on that in his upcoming Effect Days presentation), and this week he gave the community a sneak peek of a language service feature to quickly convert an existing Effect-returning function into an Effect.fn to get improved traces and more concise definitions.
Lucas Barake published an article about Building a Composable Policy System in TypeScript with Effect as well as a video about handling permissions in TypeScript featuring Effect.
Effect content update
- Maxwell Brown and Tim Smart were live on X(Twitter) and Twitch on Tuesday with a new episode of Reimagining ContentLayer with Effect.
Effect Days 2025 Updates
This week, we published Michael Arnaldi’s closing remarks, where he unveiled the upcoming Effect 4.0 with major performance improvements, smaller bundles, STM integrated into core, and more!
In this short interview during the community day, Michael talks about the origins of Effect, what he hopes for its future, and his favorite thing about Effect.
Cause & Effect Podcast
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 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. Give it a listen and let us know what you think on our social media or Discord!
Effect Merch Store
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 job opportunities
More and more companies are adopting Effect in their projects. Here’s a list of companies looking for software engineers with Effect experience:
Expand.ai : Founding Engineer
Platonic Systems : Remote Effect Engineers
Inato : Senior Product Engineer
Medbill.ai : Founding Software Engineers (full-stack and backend)
Oneiro Solutions : Software Engineer - Core Team. Join Effect Discord and DM leighman for further info.
Microsub : TS Developer
Samsung Food : Full Stack Developer
Stealth team looking for an Engineer with experience in Effect. 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.
Closing notes
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
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