Meta Open Source @MetaOpenSource
Empowering diverse community through open source technology. opensource.facebook.com Menlo Park, California Joined July 2013-
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The 2026 Python Type System & Tooling Survey is live 📝 No typing experience needed, your perspective as a Python dev matters most. Take a couple minutes to help improve Python typing for all! 👉 surveymonkey.com/r/python_typing This survey was developed with support from the Pyrefly team at Meta, the PyCharm team at JetBrains, the Python team at Microsoft, and the typing community on discourse.python.org
🚀 Introducing Astryx from Meta – an open source design system that’s AI fluent and fully customizable without dependencies. 150+ accessible components, brand-level theming, ship-ready templates, and a CLI. Built at Meta over 8 years, now yours. Astryx Design → astryx.atmeta.com and GitHub → github.com/facebook/astryx
Python is the most used programming language at Meta. This year marks our 10th consecutive year as a sponsor of the Python Software Foundation, the organization dedicated to advancing and protecting the language and its community. In this post, we reflect on why we invest in the PSF, and why we believe organizations that depend on Python share a responsibility to support it. Read more: engineering.fb.com/2026/06/30/ope… #Python #OpenSource #PSF
We’re thrilled to share that Pyrefly, our open source type checker and language server for Python, has officially reached v1.0! This has been a huge team effort. Since our beta release last November, we've shipped over 60 updates, fixed hundreds of bugs, and added features the community has been asking for. Check out our latest video and blog walking through what you can expect from the latest release: Video: youtube.com/watch?v=_o0TZG… Blog: pyrefly.org/blog/v1.0/ We also want say a huge thank-you to the open-source community for helping us get here. 🙏
The official Python Developers Survey is currently open 📝 🙌 Take the survey now — it takes less than 15 minutes to complete and helps the open source community understand the evolving needs of Python users. The survey is a joint initiative developed by the Python Software Foundation and JetBrains. Link: surveys.jetbrains.com/s3/python-deve…
⚡️OSS Project Spotlight⚡️ Yoga is a cross-platform layout engine that brings Flexbox to any environment—not just the web. It powers the layout for massive frameworks like React Native, enabling you to build responsive UIs once and run them anywhere. yogalayout.dev
⚡️OSS Project Spotlight⚡️ Lexical is an extensible text editor framework designed for reliability, accessibility, and performance. It provides a powerful, framework-agnostic engine for building sophisticated text editing experiences on both the web and iOS. Learn more: lexical.dev
New Meta Open Source Content 🔎 Four type-narrowing patterns that make Python type checking more intuitive. 🐍✨ From tuple length narrowing to hasattr guards, see how Pyrefly helps reduce the need for explicit casts in your code. Learn more here: pyrefly.org/blog/type-narr…
Once the build finishes, Infer outputs a list of potential issues directly in your console and generates a detailed infer-out/ directory. It’s used at scale at Meta to analyze code changes every day. Read the full engineering deep dive here: engineering.fb.com/2017/09/06/and…
Using it is surprisingly simple. You don't need to change your code—just prefix your usual build command with infer run --. For example: • Gradle: infer run -- ./gradlew build • Maven: infer run -- mvn compile • Make: infer run -- make
🔎 Meta Open Source 101🔎 Want to catch null pointer exceptions and resource leaks before they crash your app? Use Infer, a static analyzer that works by wrapping your build command to detect complex bugs in Java, C++, and Objective-C. Get started: fbinfer.com
⚡️OSS Project Spotlight⚡️ IGListKit is a data-driven UICollectionView framework for building fast lists on iOS. It features a decoupled diffing algorithm that handles updates automatically, eliminating reloadData or performBatchUpdates. Learn more: instagram.github.io/IGListKit/
Python typing is trending — and the community has spoken! 📊 From improved readability to better tooling support, see what developers love (and struggle with) in 2025: engineering.fb.com/2025/12/22/dev…
🔎 Check out our new video on Pyrefly’s Pydantic support Pyrefly currently offers experimental support for Pydantic, bringing improved static type checking and IDE integration to your data models. 📷 Watch the video: youtu.be/zXYpSQB57YI #Python #TypeChecking #OpenSource
🚀 New from Meta AI Research: Souper-Model! By smartly averaging multiple model weights using a method called SoCE (Soup Of Category Experts), the team achieved strong performance without retraining a whole new model. Read more here: ai.meta.com/research/publi…
Announcing Pyrefly is now in Beta 🎉 Pyrefly is a super fast, open source language server and typechecker for Python. We’ve been working closely with our open source community to improve performance, add new features and address bugs. Learn more: youtu.be/4o0RLJJ-FAo
🚀 New Blog Post Alert 🚀 Ax, our OS adaptive experimentation platform, uses machine learning to automate and optimize complex experiments. Discover real-world applications of AX across AI, GenAI, infrastructure and even physical engineering. Learn more: engineering.fb.com/2025/11/18/ope…
⚡️OSS Project Spotlight⚡️ Below is a powerful resource monitoring tool for Linux that provides deep insights into system performance, including CPU, memory, I/O, and more — all from an intuitive terminal interface. Learn more: github.com/facebookincuba…
🚀 StyleX: Open Source Styling Library for CSS at Scale! StyleX is the styling system that combines the best of CSS-in-JS ergonomics with the performance of static CSS—making styling expressive, type-safe, and lightning fast. 👉 Link: engineering.fb.com/2025/11/11/web… #OpenSource #CSS
AI at Meta @AIatMeta
853K Followers 366 Following Together with the AI community, we are pushing the boundaries of what’s possible through open science to create a more connected world.
Seb ⚛️ ThisWeekIn... @sebastienlorber
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David K 🎹 @DavidKPiano
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Soumith Chintala @soumithchintala
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Jared Palmer @jaredpalmer
110K Followers 3K Following VP of Engineering @Cognition Previously: VP Eng @Microsoft. VP of AI @Vercel, Creator of @v0 and @aisdk, Founder of @Turborepo (acquired by Vercel)
Saiyam Pathak @SaiyamPathak
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Matteo Collina @matteocollina
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jordwalke @jordwalke
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Shopify Engineering @ShopifyEng
60K Followers 707 Following Making commerce better for everyone. Follow us for technical discussions and updates on how engineers build @Shopify. Explore open roles: https://t.co/NFSvvCJBXt
Engineering at Meta @Meta_Engineers
216K Followers 197 Following Engineering at Meta is a technical news resource for engineers interested in how we solve large-scale technical challenges at Meta.
Sindre Sorhus @sindresorhus
66K Followers 523 Following I make apps and open source. Made @awesome__re. Also: @sindre_gh_repos @[email protected]
Jamon @jamonholmgren
35K Followers 4K Following Coding since 1992. Founder/CEO @infinite_red (mobile app dev experts), game dev @jammingames, hockey goalie, Lutheran, dad x4, gpa x1.
📦🛠👷🏻�... @TheLarkInn
45K Followers 3K Following Speaker, engineer, 🕸️📦 @webpack Core Team, dad, views are my own. SWE @microsoft making @rushstack; Monorepo Janitor for ODSP. Always bet on #JavaScript
Marc @mrousavy
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vjeux ✪ @Vjeux
56K Followers 596 Following Frenchy Front-End Engineer at Facebook. Co-creator of React Native and Prettier. Creator of Excalidraw, "CSS-in-JS", Yoga and React Conf.
Pete Hunt 🚁 @floydophone
36K Followers 972 Following Dad Frameworks @Vercel Prev: Dagster, Twitter, Excalidraw, Smyte, Instagram, Facebook, React.js
Storybook @storybookjs
26K Followers 394 Following Industry standard frontend workshop. Develop, test, and document components with ease. Open-source & maintained by @chromaticcom
Zack Jackson @ScriptedAlchemy
19K Followers 736 Following Infra Architect @ ByteDance. Maintainer of @webpack @rspack_dev - creator of #ModuleFederation #auADHD #synesthesia own opinions.
Google Open Source @GoogleOSS
82K Followers 145 Following Announcing new open source releases, exploring projects, sharing how we approach FOSS, and supporting communities around the world.
Shiva @shiva_426
5 Followers 116 Following
鈴空スタジオ�... @SuzukuStudio
28 Followers 414 Following @ShoutLiberteの開発者アカウントやで! AI秦谷美鈴(及びOSS版の鈴空エージェント)を筆頭に個人開発しているものの情報や、ローカルLLMを中心にテックの話題をするで! 環境:RX7900XTX 24GB+ DDR5-6000 32GB×2 (ポストは全て手入力です。)
Shreekant sharma @Shreekant21
34 Followers 471 Following मस्ती का तन मस्ती का मन, क्षण भर जीवन मेरा परिचय।
Mohamed @BigDeal_Zeta
17 Followers 2K Following
Intelarkam | BFOIKE C... @Intelarkam
27 Followers 213 Following Web3 Researcher | Deep dives into DeFi, L2s & Tokenomics | Data over hype | Exploring the future of decentralized tech
Garon Taitz @MrGaronTaitz
118 Followers 2K Following Data Analyst in NYC | Building interactive dashboards & turning raw data into insights. | Stack: Tableau, SQL, Python | Tableau Public portfolio below👇
TermGhost @RmRfMyEx
70 Followers 3K Following Wireless echo. Rm -rf'd my tracks. Proton'd. Linux soul, rapid response coded. Privacy's law.
Mochi @Mochi_gng
27 Followers 105 Following $MOCHI — More than just a meme coin. Powered by community. Fueled by big dreams. 🐹✨. soon will be launch 🚀
Michal @MichKornacki
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Bad Sector Cinema @badsectorcinema
9 Followers 492 Following Socialist & anti-imperialist. Pro-labor, class-conscious, and dedicated to bodily sovereignty, universal human equity, and a solarpunk future.
Pigasus Technologies @PigasusTech
2 Followers 534 Following Pigasus Agent Framework PAF is the governance, safety and interoperability layer that makes physical-world agents deployable and accountable.
Sevvy ∆ Creative Sh... @webcodersevvy
39 Followers 740 Following 👨🏻💻 Shopify Headless Storefront ⚛️ AstroJS x SolidJS x GraphQL 🛒 E-commerce Stores ✉️ [email protected]
Shashwat @Kushagra_1996
2 Followers 55 Following
Ashton @Ashtongzuw
0 Followers 149 Following
Bryce Horner @bryce_horner
191 Followers 2K Following Commercial real estate broker advising owners, operators, and investors. Executive Vice President, Capital Markets with @HBWilliamCo
L Ward @Lwardo4
895 Followers 5K Following WxWatcher🌪️ Mizzou Alum 🖤💛🐅 How you treat people reveals who you are. Words are easy—actions show truth & character *5years*LC#POTS#Hashi DYSAUTONOMIA
Kivvu wu @sngwng256451
1 Followers 171 Following
ginger anne Chesnutt-... @rosyposie19601
1K Followers 5K Following twitch streamer and YouTube streamer and trying a relationship with @mathieucar1. was taken away from my family in 1991 Adopted name alexandria kaufman
Speculatooooor @speculatooooor
2 Followers 2K Following
Rajveer Rathod | Velo... @Rajveer13Rathod
90 Followers 399 Following 🌟 Exploring life one adventure at a time 🌍 🧘♂️ Mindful soul connect and share journeys! Life is sweet!
Q @XXXXLibrary
6 Followers 350 Following
Nihal Singh @nihalssingh
505 Followers 3K Following Founding Research Engineer @fluctaai◦Ph.D. @UCSB◦AI Hardware-Software Co-Design◦Probabilistic Computing◦ex @HPE_labs @MicronTech @EPFL @RenesasGlobal
JM @JM30721802
0 Followers 47 Following
Starfish @WaStarfish
23 Followers 914 Following
Lu @lu_fwg
32 Followers 175 Following
TGIE @TGIE57
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Swetiepie @Justsomone42
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Robert Camilleri @RobCamilleriX
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Charles Isaac Velasco @chrls_vlsc
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dio @subinbyf
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DESIGNZIA @hubnewdesign
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provaxis @provaxis00pm
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Zsh @Zsh01562896
5 Followers 266 Following
Kunal Sutar @kunalksutar
1 Followers 169 Following Experimenting with AI, software, hardware and open source | ESED IITB'25
Sadeed khan @Sadeedkhanjrna
0 Followers 215 Following
Financial Frontier @FiFrontierX
364 Followers 325 Following AI Powered Datacenter Hunting, Detection & Response (Cyber Combat Veterans) American Living in Thailand https://t.co/lp4dVcbewS & https://t.co/IiV1XuC5MN
mugil mangalakumaran @mugilmanga94123
12 Followers 1K Following
zahid shigri @zahidshigri13
16 Followers 1K Following
AI at Meta @AIatMeta
853K Followers 366 Following Together with the AI community, we are pushing the boundaries of what’s possible through open science to create a more connected world.
brian vaughn @brian_d_vaughn
45K Followers 212 Following I'm not here anymore. Find me on Bluesky (https://t.co/Udh3FXt145), GitHub (https://t.co/DrecpCDvfq), or SoundCloud (https://t.co/DlqMMCb2o5)
David K 🎹 @DavidKPiano
90K Followers 3K Following Making state machines at @statelyai · I play piano
PyTorch @PyTorch
513K Followers 95 Following Tensors and neural networks in Python with strong hardware acceleration. PyTorch is an open source project at the Linux Foundation. #PyTorchFoundation
Soumith Chintala @soumithchintala
325K Followers 1K Following Building new things @thinkymachines. Also dabble in robotics at NYU. Cofounded @PyTorch. AI is delicious when it is accessible and open-source.
jordwalke @jordwalke
67K Followers 812 Following Created @reactjs and @ReasonML. Formerly @facebook. Product at @replit. Vibe coder
Engineering at Meta @Meta_Engineers
216K Followers 197 Following Engineering at Meta is a technical news resource for engineers interested in how we solve large-scale technical challenges at Meta.
Jamon @jamonholmgren
35K Followers 4K Following Coding since 1992. Founder/CEO @infinite_red (mobile app dev experts), game dev @jammingames, hockey goalie, Lutheran, dad x4, gpa x1.
MJ @mjackson
72K Followers 1K Following Building @remix_run at @Shopify. God hath not given us the spirit of fear; but of power, and of love, and of a sound mind – 2 Tim 1:7
Christoph Nakazawa @cnakazawa
35K Followers 149 Following @cloudflare and @voidzerodev built https://t.co/0OwN9doMDp, Athena Crisis, Codiff, https://t.co/tGexL75M8l, jest, metro, yarn and mootools. https://t.co/HKzv7XuHs3
vjeux ✪ @Vjeux
56K Followers 596 Following Frenchy Front-End Engineer at Facebook. Co-creator of React Native and Prettier. Creator of Excalidraw, "CSS-in-JS", Yoga and React Conf.
Google Open Source @GoogleOSS
82K Followers 145 Following Announcing new open source releases, exploring projects, sharing how we approach FOSS, and supporting communities around the world.
Major League Hacking ... @MLHacks
67K Followers 9K Following MLH is a 600k+ member community empowering the next generation of student developers through hackathons.
Prisma @prisma
79K Followers 55 Following Your TypeScript app, from prompt to production npm create prisma@latest 📚 https://t.co/jPVvgllHKl 💬 https://t.co/GSSBwEHTOv
Uber Engineering @UberEng
67K Followers 5K Following Engineering @Uber, from practice to people. https://t.co/iIenzuSNxH ✨
Astryx from Meta @Astryxdesign
2K Followers 18 Following An open source design system that's fully customizable and agent ready. Try it out at https://t.co/rBHFBYS76h and https://t.co/OyHbxy4Jrl
Zoho Social @ZohoSocial
120K Followers 181 Following #SocialMediaManagement software for businesses and agencies. Part of the @Zoho suite.
Jesse Smith @hjessmith
464 Followers 46 Following Graphics/HCI/AI Researcher. I like helping people to animate their hand drawings. Currently working on https://t.co/ApxFq1TjIG
Pascal Hartig @passy
5K Followers 800 Following Building @flipper_fb. Bringing down the fossil fuel industry with @FossilFreeLDN. He/him. @[email protected]
Paul E. McKenney @paulmckrcu
3K Followers 229 Following
Christopher Beddow @cbed32
2K Followers 3K Following Geospatial systems, OpenStreetMap, street-level imagery, VLMs, AI+maps. Building tools to make the physical world machine-readable. Montana 🇺🇸 → Schwyz 🇨🇭
Abhishek Tripathi @AbhishektripMe
280 Followers 459 Following XR Maps @meta (previously @unity @mapbox, @maketafi, @esri, @ibm). @uutah alum , 3D, graphics, GIS, maps, AR/VR.
Neil Mitchell (neildm... @ndm_haskell
5K Followers 163 Following Haskell/Rust programmer. Views expressed are my own.
Rapid Editor @mapwithrapid
2K Followers 532 Following 🌎🌍🌏 Improve #OpenStreetMap w/open data, open source, thoughtful UX & machine learning. 🦾 Join the community also on Facebook: https://t.co/KQ995xWPH9
Lexical @lexicaljs
3K Followers 6 Following Lexical is an extensible text editor framework that provides excellent reliability, accessibility and performance.
Brii (she/her) 🧠�... @Brii_toe_knee
10K Followers 5K Following Ex-Meta | AI Documentation Strategist | I help AI companies close the gap between their ethics principles and their user-facing docs | Founder, TechniDox
Hazem Saleh @hazems
1K Followers 589 Following Staff Software Engineer @Meta NY 🇺🇸 | Tech Lead | Speaker | Best Seller Books Author | Open Source Committer. I ❤️ 📚⚽💻✈️. All tweets are my own.
Evyatar @evyataral
922 Followers 805 Following Software Engineer @Meta. 🎙 tech speaker. Open source: @vestjs 🦺 validations framework https://t.co/dmyTlr5d41, Emoji-Picker-React, FlairUp 🎩 css-in-js
velox-lib @velox_lib
30 Followers 9 Following
Overture Maps Foundat... @OvertureMaps
4K Followers 42 Following Collaborative effort to develop interoperable open map data for mapping services worldwide | @linuxfoundation open source project
Danny Yaroslavski @dannyaroslavski
3K Followers 2K Following building @playmathlings; previously @meta @google @lightbotcom @spriteboxcom
Presto @prestodb
4K Followers 252 Following Open source SQL query engine for data analytics and the Open Data Lakehouse. Official account of the Presto open source project.
vmoens @VincentMoens
2K Followers 787 Following Member of tech staff @IneffableLabs TorchRL maintainer (@torchrl1) at PyTorch. Neuroscience PhD, ex-M.D.
torchrl @torchrl1
872 Followers 171 Following TorchRL is the open-source Reinforcement Learning (RL) library for PyTorch.
Sean Keegan🤓 🥏 ... @DevRelSean
770 Followers 739 Following Developer Advocate @Salesforce. Previously at @Microsoft/@Meta/@getpostman
Rashed Talukder @RashedTalukder
369 Followers 150 Following A lover of technology and humanity — asking myself will it blend? My opinions are my own.
Relay @RelayFramework
995 Followers 6 Following Relay is a framework for managing GraphQL data in React applications
Dave Viner @dviner
188 Followers 385 Following papa, internet dreamer and doer. @MetaOpenSource and Developer tools at Facebook
Skipper Jon Janzen @JonJanzen
167 Followers 155 Following Software Engineer @meta Open Source Tooling | @TAMU former student | he/him | https://t.co/rKwIj7u3Xl
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2K Followers 168 Following We're building a unified platform for sharing, training and evaluating dialogue models across many tasks. @FacebookAI
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29 Followers 39 Following Software engineer who has worked on console games, AR holographic displays, and VR applications. Find Zac on github as pr0-zac
The Linux Foundation @linuxfoundation
593K Followers 9K Following A nonprofit organization enabling mass innovation through open source. #linux #kubernetes #riscv #hyperledger #anuket #openssf #openjs #o3de and more!
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10K Followers 1K Following A universe of events and platforms focused on open source, open tech and the open web. #AllThingsOpen
Philip Bell @GitMetaPhysical
115 Followers 211 Following @MetaOpenSource Developer Advocate for @prestodb and @velox_lib focused on #bigdata #opensource
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Ben Grant @BenGrant49
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Suraj Subramanian @subramen
729 Followers 564 Following Developer Advocate & Gen AI Engineer @MetaAI and @PyTorch. Excited, optimistic but also moderately cautious about the new AI-powered world we're in.
👩💻 Paige Bai... @DynamicWebPaige
76K Followers 2K Following ✨AI should be about empowering humans, building understanding, and making dreams realities. 👩💻 DevRel Eng. Lead @GoogleDeepMind ex-@GitHub || views = my own!
ui.dev @uidotdev
11K Followers 5 Following We help JavaScript developers make more money - and enjoy themselves in the process. https://t.co/wLxlsXDVz1 – https://t.co/y7dJN8BvW0 – https://t.co/KpA0uFAbyn – https://t.co/NdfEyjHUXq
Brian Johnson @brianjo
796 Followers 1K Following Tech hacker at Meta, living 10 minutes from the Magic Kingdom.
Ben Maurer @bmaurer
486 Followers 13 FollowingThomas Van Bouwel @tovanbo
5K Followers 872 Following Developer of @CubismVR and @LaserDanceGame. Recovering architect. Previously: Product Engineer @ResolveBIM & dev on Panoptic 🇧🇪 🇧🇷 - he/him
Garuda Hacks @GarudaHacks
146 Followers 1 Following 🇮🇩 Indonesia's International Virtual Hackathon 🚀 Garuda Hacks 2.0 Coming Soon Q3 2021 🏆 Major League Hacking APAC League
Scott Sunarto @smsunarto
26K Followers 4K Following founder/ceo @ArgusLabs_, (traumatized by) distributed systems, prev @Berkeley_EECS
The Entrepreneurial C... @CoderPodcast
936 Followers 0 Following An interview show where I talk to developers, programmers, and coders who are in business for themselves. Hosted by @ryanchenkie
Monica Lent @monicalent
24K Followers 355 Following Technical cofounder of @affilimateio, affiliate content insights for media companies. Sharing what I learn about SaaS and growth along the way.
Navyata Bawa @NavyataBawa
367 Followers 296 Following Developer Advocate @Meta | Formerly @MetaAI @Samsung @Activision @DeepMotionInc @Toshiba | Tech enthusiast | Loves traveling, ai, art and @iNS0mmniac
VR Manchester @VRManchester
1K Followers 290 Following A community for VR enthusiasts in Manchester to meet, share & play. Mailing list: https://t.co/94HtctdWSb
Meta Elevate @MetaElevate
3K Followers 35 Following Amplifying voices. Elevating businesses. Championing legacy builders. #OnTheRiseTogether
Instagram Comms @InstagramComms
230K Followers 4 Following 👋 We’re Instagram’s PR team! Are you a reporter on deadline? Email us at [email protected]
Luca Mefisto @LucaMefisto
3K Followers 2K Following AR/VR engineer @Meta Interaction SDK. Neurology tools and experimental VR things. Swimmer and Math-Rocker. @VRManchester & @GRInteractiva parent.


















