Our next in-person meetup is going to be in Vienna 🇦🇹 → Thursday, December 18 | 18:30 → LEAN-CODERS Sign up below: luma.com/rc84shks
This Week in Effect - 2025-12-05
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 5800+ members!
Here are all the technical changes from the past week.
- RcMap: support dynamic idleTimeToLive values per key (Feature, next-minor)
- Update generated OpenRouter definitions and fix logprob schema (Refactor, Bug Fix, Optimization)
- Update generated OpenAI schema definitions (Feature, Optimization)
- Support idempotent offers to PersistedQueue (Improvement)
- Ensure PersistedQueue memory driver removes items (Bug Fix)
- Ensure Devtools Tracer does not cut off span options (Bug Fix)
- Widen otel logs peer dep range (Bug Fix)
- Support idempotent offers to PersistedQueue (Improvement)
- Support idempotent offers to PersistedQueue (Improvement)
- Add Workflow.scope, a seperate Scope that only closes on completion (Feature)
Don’t miss our upcoming Effect Vienna 🇦🇹 Meetup on December 18, organized by Sebastian Lorenz.
To stay informed about future events, visit our Effect Community Events calendar and subscribe for updates.
- Advent of Effect is in progress! Join our Discord to solve the Advent of Code riddles with Effect and post your solutions in our dedicated
advent-of-effectchannel.the time has come adventofeffect.com
- Kit Langton gave a sneak peek of the upcoming
spanopticon, a TUI OTEL visualizer for Effect programs.𝚜𝚙𝚊𝚗𝚘𝚙𝚝𝚒𝚌𝚘𝚗 ← 👀 TUI OTEL visualizer for Effect programs. Coming soon.
effect.ninja – An interactive Effect course by Jonas Templestein.
effect-json, a Type-safe, schema-driven JSON serialization for TypeScript and Effect, has been updated to v. 0.2.0. Project by Paul Philp.
effect-weather - A CLI weather application built with Effect that fetches and displays current weather information for any location using the OpenWeatherMap API. Project by Bishal Roy.
- SvelteKit and Effect with Dillon Mulroy by Svelte Society.
Play
- Thanks to Jonas Templestein and Rasmus Gustafsson for the kind words on Effect and our community! ♥️
My god - effect logger + effect config with redacted values (i.e. secrets) is so good I can just do stuff like Effect.logDebug(config) without worrying about exposing API keys (they become <redacted> in the logs) Unlike when you cobble together typescript logging libraries with
@EffectTS_ discord is wild > User: i think i found a bug in X > @tim_smart LITERALLY 2 min later: this PR fixes this [PR link] and this happens OFTEN. the dedication is palpable
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Maxwell Brown and Tim Smart were live on X and Twitch with ChEffect.
Working on ChEffect - A Local-First Meal Planning App written with Effect x.com/i/broadcasts/1…
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ChEffect - Part 9: A Local-First App built w/ Effect & LiveStore and ChEffect - Part 10 are 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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14.ai: Founding engineer
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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. -
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. -
Embedded Insurance is hiring for a Senior Software Engineering position.
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Expand.ai: Founding Engineer
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Freckle.io is hiring Platform Engineers with experience in Effect.
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Globe Commerce: Founding Product Engineer
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Goblins is looking for a Product Founding Engineer. See the job posting in the
#job-boardchannel on our Discord. -
Heartbeat: Senior Software Engineer
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Interfere: Founding Product Engineer and Founding AI Engineer
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Introw: Staff Software Engineer
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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. -
Margins: Product Engineer
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Medbill.ai: Founding Software Engineers (full-stack and backend)
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Microsub: TS Developer
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Oneiro Solutions: Software Engineer - Core Team. Join Effect Discord and DM leighman for further info.
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PhosPhor is hiring engineers experienced in Effect. You may also reach out to the Phosphor team on our Discord.
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Platonic Systems: Remote Effect Engineers
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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. -
Ressio: Senior full stack Engineer
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Samsung Food: Full Stack Developer
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Sellhub is looking for a Backend Engineer. See the job posting in the
#job-boardchannel on our Discord. -
Software Intelligence Works: Senior Full-Stack 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. -
Supermemory: Founding Backend / Infrastructure Engineer
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Superwall: Full-stack Mobile Developer
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Tranched: Full-stack Engineer Web3
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Vitalize Care is hiring a full-stack engineer with Effect experience: Full-Stack Engineer
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Wander is hiring Software Developers with experience in Effect.
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Warp is hiring a Product Engineer
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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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Job opening for Japanese-speaking developers
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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. -
Stealth team looking for a software engineer with Effect experience – see the job posting in the
#job-boardchannel on our Discord. -
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.
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