Jérémy Magrin

Développeur React Native Senior & CTO | 10+ ans d’expérience en mobile & web

[Jérémy Magrin @jeremy_mgr]

Seven senior React Native engineers. One collective.

No bench, no juniors hidden behind a senior's name
Any one of us can carry your mission, and nothing ships without another senior's review

This is https://t.co/gWjdX48mws 👇

[Jérémy Magrin @jeremy_mgr]

https://t.co/V04sL7xRc7

[Jérémy Magrin @jeremy_mgr]

Seven senior React Native engineers. One collective.

No bench, no juniors hidden behind a senior's name
Any one of us can carry your mission, and nothing ships without another senior's review

This is https://t.co/gWjdX48mws 👇

[David Leuliette @flexbox_]

Ça stream en ce moment même sur le Cross Platform Show

T'as encore le temps de nous rejoindre pour poser tes questions en live !

https://t.co/GbhN9Sbmu3

[Jérémy Magrin @jeremy_mgr]

@IntCyberDigest Someone forgot a small security patch

[Jérémy Magrin @jeremy_mgr]

LE GROS CHAT is coming !

[Mistral AI @MistralAI]

Meet Mistral Large 4, aka Le Chonk.

• 1T parameters, natively multimodal. 49B active.
It is the best open weights model from US or Europe on aggregated benchmarks.
• State-of-the-art on critical workloads, including cyber defense, manufacturing and finance and it surpasses closed frontier models on visual grounding.
• Forged in Europe end-to-end and is deployable from Europe via our own Mistral Cloud infrastructure.
• Available to all via API today. Working with cybersecurity partners privately.

Open weights release end of October.

[Jérémy Magrin @jeremy_mgr]

Still young (0.17): in my runs the agent sometimes closes a bottom sheet without wrapping up the step

But mixing deterministic + agentic steps with a replay cache is a really smart idea !

[Jérémy Magrin @jeremy_mgr]

Your e2e tests break every time you move a button

I tried e2e by @TesterArmy on my iOS app: describe a goal with agent.act(), keep locators where you need precision

Run 1: the agent figures it out. Run 2: replayed from cache, no AI
Renamed a tab: Maestro broke, e2e didn't

[Jérémy Magrin @jeremy_mgr]

Open source (Apache-2.0): https://t.co/07VZi6IKQ8
Built by @okwasniewski, @SzymonRybczak and the rest of the TesterArmy team
On mobile it runs on agent-device by @callstackio

Congrats guys !

[William Candillon @wcandillon]

We are releasing React Native Skia version 3.0 which runs WebGPU by default. By moving away from the OpenGL-centric design, it allows for multithreading by default as well as deep integration with three.js, vision camera, and transformer.js

https://t.co/FUpMonlHd3

[Jérémy Magrin @jeremy_mgr]

@wcandillon @o_kwasniewski Congrats !!! 👏

[Jérémy Magrin @jeremy_mgr]

@expo What are the specs ? A bit curious haha 🙂

[Jérémy Magrin @jeremy_mgr]

@betomoedano Maybe it can be useful 🙂
https://t.co/EeVzmiEuED

[Jérémy Magrin @jeremy_mgr]

I made Intl.PluralRules, RelativeTimeFormat, ListFormat and Locale native on React Native's Hermes engine.

Same app, same tap, real time on a Pixel 8a: 89× faster than the FormatJS polyfills.

Up to 385× per call. 399 KB less JavaScript. One import.

hermes-intl, open source 👇

[Jérémy Magrin @jeremy_mgr]

Same output on iOS and Android: one 2,656-case corpus, one hash on both. 838 of 842 test262 runs pass.

The trade-off: 1.0 to 1.7 MB of native code per ABI with all 514 locales, about 0.6 MB for a custom 5-locale build.

[Jérémy Magrin @jeremy_mgr]

I made Intl.PluralRules, RelativeTimeFormat, ListFormat and Locale native on React Native's Hermes engine.

Same app, same tap, real time on a Pixel 8a: 89× faster than the FormatJS polyfills.

Up to 385× per call. 399 KB less JavaScript. One import.

hermes-intl, open source 👇

[Jérémy Magrin @jeremy_mgr]

Per call on a Pixel 8a, vs FormatJS (median of 3 runs):

https://t.co/XmvFwmxHAG: 202×
PluralRules.selectRange: 385×
RelativeTimeFormat.format: 318×
first new Intl.Locale(): 126×
ListFormat.format: 8.5×, joining strings is already cheap in JS

[Jérémy Magrin @jeremy_mgr]

@charles_maddock Everything replaced with a WebView, joking
Something related to the package manager, old lock file, or something like that

[Jérémy Magrin @jeremy_mgr]

@o_kwasniewski Wow congrats, can't wait to test that ! 🚀

[Jérémy Magrin @jeremy_mgr]

@milos_gis Maybe you should also reference the original author of your map 😉