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 5510+ members!
Technology
Effect 3.19 has been released!
Effect 3.19 has been released! 🚀 → effect/cluster improvements → HashRing module → Effect.fn.Return More in the blog post by @tim_smart: effect.website/blog/releases/…
More features coming to Schema V4: JSON Schemas sent to AI platforms will be automatically enriched with generated descriptions.
Schema v4 🤝 AI platforms The JSON Schemas sent to AI platforms are simplified because most support only a limited set of features, we can automatically generate descriptions to fill in the gaps
Here are all the technical changes from the past week (note that changes included in the 3.19 release will not be listed).
Effect Core
- Array.window signature has been improved (Feature)
- Tie Entity lifetime to layer scope (Improvement)
- Preserve Layer.mergeAll context order (Bug Fix)
- Use standard formatting function in Config error messages (Bug Fix)
Effect AI
- Fix Response.Part, AllParts, StreamPart not inferring Schema properly if toolkit is WithHandler (Bug Fix)
Effect CLI
- Fix log level cli arg infinite loop (Bug Fix)
Effect Cluster
- Retry interrupted workflow activities (Bug Fix)
- Add Sharding shutdown log (Feature)
- Prevent interrupt suspends from propagating (Bug Fix)
- Change workflow re-registration defect to a warning (Improvement)
- Tie Entity lifetime to layer scope (Improvement)
- Add premptiveShutdown option to ShardingConfig (Feature)
- Add interruption support to sql-pg (Feature)
- Preserve Layer.mergeAll context order (Bug Fix)
- Add timeout to pg query cancellation (Bug Fix)
Effect RPC
- Expose disableFatalDefects option in RPC server public API (Improvement)
- Fix RpcServer.toLayer type (Bug Fix)
Effect SQL
- Allow any type to be used as sql parameters (Improvement)
- Fix handling of multi-statement queries (Bug Fix)
- Add interruption support to sql-pg (Feature)
- Add timeout to pg query cancellation (Bug Fix)
Effect Workflow
- Retry interrupted workflow activities (Bug Fix)
- Tie Entity lifetime to layer scope (Improvement)
Community Highlights
- Yet another community milestone: Effect has surpassed the 5 million npm downloads per week!🚀
Don't get us banned from NPM for spamming!
- Effect is back in Vienna for an Effect Meetup on Thursday, December 18th.
Back in Vienna! 🇦🇹 Come meet the community on Dec 18 at @Lean_Coders' office. → Reserve your spot: luma.com/rc84shks
- teej dv continues the work on rebuilding Terminal using Effect.
alchemy-effect, the Infrastructure-as-Effects (IaE) framework that unifies business logic and infrastructure config into a single, type-safe program, is open on GitHub.
- LLMs ❤️ Effect!
Yes, LLM's are good at Effect: Here's Claude Code offering to refactor my existing git logic into a service.
- Effect mentioned at the UHC special 20th Builder Talk.
- Dillon Mulroy livestreamed three new episodes of Building a family recipe app with LiveStore, Effect, and CF Workers.
Effect Content Update
- The seventh 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) below.
Effect Office Hours x.com/i/broadcasts/1…
- 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…
- ChEffect - Part 7: A Local-First App built w/ Effect & LiveStore and 🔥 Office Hours 6: Effect Context & Layers + Confect Library (Effect + Convex integration) are now on our YouTube Channel.
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 the benefits of integrating Effect into their tech stack.
We’ve published our fifth episode with Samuel Briole, CTO of Spiko, a Paris-based FinTech startup building infrastructure for issuing regulated financial products on public blockchains, specifically risk-free products.
Spiko utilizes Effect extensively from day one, for both backend and frontend development, particularly for managing asynchronous operations, API integrations, and smart contracts.
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:
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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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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.
Disclaimer: Please note that these job postings are shared for informational purposes, and we encourage applicants to verify details directly with the hiring companies.
Effect Merch Store
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
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