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!

• Effect Documentation
• Installing Effect

Recent major updates:

• Effect v4 Beta Release! 🚀
• Effect AI SDK Release.
• Durable workflows in TypeScript with @effect/workflow - currently in alpha.
• 6250+ community members on Discord.

 

Technology

Effect v4 Beta updates

Here are the main changes that landed in effect-smol:

• Breaking: ServiceMap renamed to Context: The ServiceMap module has been renamed back to Context, realigning with Effect v3 naming conventions. This is one of the most impactful changes of the week for anyone already building on the v4 beta.

• IndexedDB expansion: Added streaming and offset support to IDB queries, compound index improvements, encoded types for IDB queries, a .reverse() method to IDB selects, a rebuild API for IDB databases, an improved transaction API, and support for customizing IDB durability. Model.Class can now also be used directly for IndexedDB schemas.

• Schema additions & fixes: Added StringFromBase64, StringFromBase64Url, StringFromHex, and StringFromUriComponent schemas for decoding encoded strings into UTF-8, improved Schema.encodeKeys typing, fixed several missing ~rebuild.out types, fixed duplicate identifier reference reuse, added a compile-time MissingSelfGeneric error for Class APIs, and fixed @category JSDoc tags.

• RPC & Entity: Added rpc ConnectionHooks, fixed Entity.keepAlive, and improved defect handling when building Entity handlers.

• Runtime & type inference: Used NoInfer in Layer constructors to prevent type erasure, fixed cache constructor inference by moving the lookup option, fixed type inference for Effect.retry when the times option is provided, and fixed Stream.toQueue types.

• CLI & HTTP: Fixed unstable CLI boolean flags, underlined active labels in CLI multi-select prompts, added support for form-urlencoded in the OpenAPI generator’s HTTP client format, and added a docs section on customizing schema error responses in HttpApi.

• PostgreSQL & internals: Guarded transaction acquire failures in PgClient.fromPool, returned resolvers directly from SqlModel.makeResolvers, added KeyValueStore.layerSql, and made Unify.unify work with the Layer module.

You can follow the full changelog directly in the effect-smol repository.

 

Community Highlights

• Michael Arnaldi ran an Effect workshop at the AI Engineer conference in London.

  

  Effect | TypeScript for the AI Era

  @EffectTS_

  · Follow

  We're getting started! Effect workshop @aiDotEngineer

  

  

  Mattia Manzati

  @MattiaManzati

  If you're at @aiDotEngineer today, don't miss Mike's workshop about "Vibe Engineering @EffectTS_ Apps" at 1 pm, Shelley!

  12:18 PM · Apr 8, 2026

  64

  Reply

  Read 2 replies

 

• effect-sql-model – an AST-based compiler that turns Effect Schema / @effect/sql model definitions into Drizzle ORM tables. Project by Emergente Labs.

  

  Francisco

  @francisco_m001

  · Follow

  We're releasing an AST-based compiler that turns @EffectTS_ schema / @effect/sql model definitions into Drizzle ORM tables. Why? Effect Schema carries far richer type information than @DrizzleORM table definitions. Define your models once as the single source of truth and let

  

  5:20 PM · Mar 4, 2026

  180

  Reply

  Read 8 replies

 

• spana – a TypeScript-native end-to-end testing framework for cross-platform test automation across React Native and web (Android, iOS, and web) from a single test suite. Project by wezter96.

 

• @catenarycloud/linteffect – Biome Grit rules for declarative Effect TypeScript composition and repository-wide style consistency. Project by Roman Naumenko.

 

• effect-autoagent – a framework for building, optimizing, and deploying AI agents as Effect services. Project by Marc Suesser.

 

• effect-claudecode - Write Claude Code plugins with Effect v4. Project by Marc Suesser.

 

Effect Content Update

• Effect Office Hours 24 🔥

Play

 

• TypeScript-Go with Effect LSP: Setup guide, features, and performance boost.

Play

 

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.

Adam Rankin, CTO at Warp, joined Johannes Schickling to talk about using Effect to bring structure and composability to a growing TypeScript codebase, enabling a small, fast-moving team to stay productive while shipping reliable payment & payroll systems.

Play

 

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:

• 14.ai: Founding engineer

• acemate.ai: Senior Backend Engineer / Developer

• 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-board channel on our Discord.

• Cari: Sr. Software Engineer, Backend & Infra.

• coteach.ai is looking for a Software Engineer – see the job posting in the #job-board channel on our Discord and DM Peter Edmonds for further info.

• Embedded Insurance is hiring for a Senior Software Engineering position.

• Expand.ai: Founding Engineer

• Freckle.io is hiring Full-stack Engineers with experience in Effect.

• Gale: SWE Intern - Remote (CAN/US)

• Gen: Senior Front-End Full Stack Engineer (TypeScript)

• Glide: Senior Frontend Product Engineer

• Globe Commerce: Founding Product Engineer

• Goblins is looking for a Product Founding Engineer. See the job posting in the #job-board channel on our Discord.

• Heartbeat: Senior Software Engineer

• Inato: Product Engineers / Fullstack Engineers

• Interfere: Founding Product Engineer and Founding AI Engineer

• Introw: Staff Software Engineer

• Lingo.dev: Senior Product Engineer - React, Node.js, UX

• Magentus: GenAI Solutions Engineer

• ManageSpace is looking for a Senior Developer to mentor other developers and migrate to Effect – see the job posting in the #job-board channel on our Discord.

• Margins: Product Engineer

• Medbill.ai: Founding Software Engineers (full-stack and backend)

• Microsub: TS Developer

• Oneiro Solutions: Software Engineer - Core Team. Join Effect Discord and DM leighman for further info.

• PhosPhor is hiring engineers experienced in Effect. You may also reach out to the Phosphor team on our Discord.

• Platonic Systems: Remote Effect Engineers

• Precurion looking for a remote‑first Founding Engineer with Effect experience – See the job posting in the #job-board channel on our Discord.

• Ressio: Senior full stack Engineer

• Samsung Food: Full Stack Developer

• Sellhub is looking for a Backend Engineer. See the job posting in the #job-board channel on our Discord.

• Software Intelligence Works: Senior Full-Stack Engineer

• spring.new, Anthropic’s flagship customer, is hiring engineers experienced in Effect. See the job posting in the #job-board channel on our Discord.

• Supermemory: Founding Backend / Infrastructure Engineer

• Superwall: Full-stack Mobile Developer

• Temper: Founding Engineer

• Tenzir: Software Engineer (Product)

• Tranched: Full-stack Engineer Web3

• Trellis AI: Product Engineer based in SF.

• Vercel: Software Engineer, Domains

• Vitalize Care is hiring a full-stack engineer with Effect experience: Full-Stack Engineer

• VST: Senior Full Stack Software Engineer

• Wander is hiring Software Developers with experience in Effect.

• Warp is hiring a Product Engineer

• A consumer music startup hiring for an Effect Backend Consultant + a full-time role based in NYC. The job posting is available in the #job-board channel on our Discord

• French-speaking startup team led by Stephan Le Dorze is looking for a freelancer to join them - see his LinkedIn post for more details.

• Job opening for Japanese-speaking developers

• 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-board channel on our Discord, DM jonpage for further info.

• Solid is hiring its early engineering team (Bay Area). The job posting is available in the #job-board channel on our Discord

• Stealth team looking for a software engineer with Effect experience – see the job posting in the #job-board channel 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.

 

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.

 

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