12k 🌟
This Week in Effect - 2025-11-21
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 build 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 3.19 Release.
- Effect AI SDK Release.
- Durable workflows in TypeScript with
@effect/workflow- currently in alpha. - The Effect community on Discord reached 5620+ members!
Here are all the technical changes from the past week.
- Fix Types.DeepMutable mapping over functions (Bug Fix)
- Add PartitionedSemaphore module (Feature, next-minor)
- Backport Effect.gen optimization (Feature)
- Add EntityResource module (Feaure)
- Add logs to first propagated span (Bug Fix, next-minor)
- Add entityRegistrationTimeout to ShardingConfig (Feature)
- Add in-memory WorkflowEngine layer (Feature)
- Ensure ClusterCron’s can be resumed if re-added (Bug Fix)
- Add EntityResource module (Feaure)
- Provide seperate close scope to EntityResource via context (Improvement)
- Add EntityResource.makeK8sPod (Feature)
- Fix partial window calculation for fixed window rate limiter (Bug Fix)
- Fix RateLimiter fixed window alogrithm (Bug Fix)
- Add RateLimiter helpers makeWithRateLimiter and makeSleep (Feature)
- Add logs to first propagated span (Bug Fix, next-minor)
- Fix: scalar configuration and types (Bug Fix)
- Add EntityResource.makeK8sPod (Feature)
- Make RpcClient socket retry schedule configurable (Improvement)
- Add in-memory WorkflowEngine layer (Feature)
- Add in-memory WorkflowEngine layer (Feature)
- This week, we celebrate another community milestone: Effect crossed 12k stars on GitHub! 🌟
- We had a great time at our NYC meetup last Wednesday! Huge thanks to Warp for welcoming us into their space, as well as Kit Langton and Harry Solovay for sharing insights on Effect and Effect AI! Appreciate everyone who came out to connect and learn.
Warp x @EffectTS_ in NYC was a blast shoutout to @EffectfulTech, @MichaelArnaldi, @MirelaPriftix and @kitlangton for bringing an awesome group
- Maybe I Was Wrong About Effect… (is it really worth it?) by Ben Davis. Spoiler alert: it is!
Play
- effect-env by Paul Philp – a TypeScript library for managing environment variables with type safety, schema validation, and security features, built with Effect, has been updated to the 0.4.1 version!
- effect-decorate - a decorative-only VSCode extension that helps reduce Effect code’s verbosity. Project by Enrico Polansky.
- Typing Terminal by Devin Jameson - a real-time multiplayer typing game built with Effect and Foldkit.
- Effect Prisma Generator - A Prisma generator that creates a fully-typed, Effect-based service wrapper for your Prisma Client. Project by Mathieu Post.
- Dillon Mulroy livestreamed three new episodes of Building effect-cloudflare, Effect TS native bindings for CF 🚀.
- The 9th episode of Effect Office Hours went live on Wednesday! We will publish an edited version on our YouTube channel soon. In the meantime, you can watch the livestream on X(Twitter)
- Office Hours 8: Effect managed runtime, error handling, fiber management, API design patterns 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 the benefits of integrating Effect into their tech stack.
We’ve published our sixth episode with Louis Vichy, co-founder of OpenRouter, who joined Johannes Schickling and Michael Arnaldi to talk about OpenRouter’s TypeScript stack, their internal tooling powered by Effect, and the engineering challenges of scaling an AI platform processing trillions of tokens weekly.
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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Supermemory: Founding Backend / Infrastructure Engineer
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Ressio: Senior full stack Engineer
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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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Superwall: Full-stack Mobile Developer
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Tranched: Full-stack Engineer Web3
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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.
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Warp is hiring a Product Engineer
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Sellhub is looking for a Backend Engineer. See the job posting in the
#job-boardchannel on our Discord. -
Goblins is looking for a Product Founding Engineer. See the job posting in the
#job-boardchannel on our Discord.
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