Michael Arnaldi
@MichaelArnaldi
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BDFL @EffectTS_, CEO @EffectfulTech, Co-Founder @matechsdigital.
London
Joined December 2012
@jdegoes JS is a great language :) almost everything should be written in JS
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Whatever you do, never ever use @Rippling they have the absolute worst user experience and support I have ever seen. Should be illegal to be this bad.
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It's not about being ready someday, it's about being ready every day. Train at home with your own personal VR shooting simulator.
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Future looks bright with more and more libraries and frameworks supporting Effect natively
@pyrons_ @EffectTS_ yes, we are already building a native Effect driver
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We've been toying with @EffectTS_ in Rivet Actors for a couple months now, sharing some progress Should we ship it? What should we change?
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Interfere is hiring a Founding Full-Stack Product Engineer and a Founding AI Engineer to join our team in New York City ๐บ๐ธ! (Visa sponsorship available) https://t.co/nAbRIT6aRo
interfere.com
Build software that never breaks - Interfere finds and fixes bugs automatically in real-time, no human intervention required.
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@alexdotjs I also appreciate you a lot, progress is achieved via disagreements thatโs what is beautiful about software design :)
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NOTHING TO SEE HERE, GUYS - possible +300% soon ! Just a random microcap, NextNRG ($NXXT), casually mentioned by Forbes in the same breath as Amazon ($AMZN) and Kroger ($KR). According to Forbes, NextNRG (NXXT) already provides fueling services and trucking support for Amazon
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I have hacked enough PHP websites in my early hacking days that I will never consider a solution that doesn't separate frontend and backend. RPC = good (model for the network), Server Action = bad (pretend the network doesn't exist).
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Coming in v4: a built-in JSON Schema to Effect Schema code generator
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Can it really be a coincidence? Smart Investors Hold Gold. Find out more at Goldhub
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@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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AWS Lambda finally gets Durable Functions. In @alchemy_run (effect), this is all it will take to transform a Function into a Workflow. No directives. No compiler. Just code.
NEW: AWS Lambda Durable Functions are LIVE. If you ever wanted to build step functions expressed as code, this launch is for you!
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It was very logical, this makes me way more bullish on Bun's future than before. Congrats to @jarredsumner and team!
lot of people saying it doesn't make sense for anthropic to buy bun but it was literally my first guess
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Our average cost per month for CrowdHealth hit its lowest EVER in 2025!!! $140.42/month for singles <55 (down 13% vs '24) $225.83/month for singles 55+ (down 17% vs '24) $476.25/month for families of 4 (down 11% vs '24) If you are looking for an affordable alternative to health
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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
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Great company, ofc they use @EffectTS_
Interfere is hiring a Founding Full-Stack Product Engineer and a Founding AI Engineer to join our team in New York City ๐บ๐ธ! (Visa sponsorship available) https://t.co/nAbRIT6aRo
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Sonnet 4.5 was struggling at this, very much struggling
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Claude Opus 4.5 is insanely good, a user asked how to use Effect RPC in fastify and the answer is not that simple, as fastify doesn't use web standard request/response you can't use toWebHandler directly, Opus made a native integration in about an hour:
github.com
Summary Adds @effect/rpc-fastify package for integrating @effect/rpc with Fastify servers Provides both Effect-based and synchronous APIs for flexibility APIs register - Register RPC handler as ...
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