chad fowler @chadfowler
programmer, general partner @blueyard, author of upcoming book Crypto & Web3: The Good Parts. prev @wunderlist, @microsoft, @rubycentral, @rubyconf @railsconf chadfowler.com New York, USA Joined February 2007-
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A rewrite starts with confidence. The old code is messy. The new code is clean. Then production begins teaching the new system everything the old one already knew.
@mitsuhiko It’s the warmup for the upcoming quantum issue tracker, Schrödinger’s Issues
Most software architecture assumes the implementation is the system. That’s why rewrites fail. The implementation contains years of accumulated memory: edge cases, operational lessons, regulatory constraints, production discoveries, failed experiments, and hard-won invariants. The code runs the system. The memory is the system
I'm slowly but surely forming a better idea how to do "better specs". The key idea is to make them structured and allowing a spec to contain structured source of truth definitions and rich artifacts such as code-defined diagrams, API/CLI/schema definitions, etc.
@sternhenri I'm spending a considerable amount of time thinking about how this applies to software generation aicoding.leaflet.pub. (also writing a not-yet-announced book for a publisher on the topic)
AI Native DevCon is live. After an opening keynote from Simon Maple ( @sjmaple ), Guy Podjarny ( @guypod ) has just taken the stage with "Skills are the New Code". As software development shifts from writing instructions to defining intent, skills, specs, and context are becoming the core building blocks of modern engineering. If you're building AI-native systems, this is exactly the conversation happening right now. Can't join us in London? Watch live from anywhere: youtube.com/watch?v=akZ85m…
@samaaron @josevalim How do we meet again
The skills you worked hard to develop as a programmer are just as valid today in the world of AI agents. Link below.
Nostalgia is not a strategy. Chad Fowler's amazing perspective on the future of systems at RubyConf Austria
One of the more fun conversations I've had in a while. @guypod and I went deep on regenerative software and the Phoenix Architecture. Give it a listen!
@swombat same. in an era of tons of copy/paste, it is clearer than ever how insanely stupid white space sensitivity as language syntax is.
When you hand an LLM a coding task and don't tell it what language to use, what does it reach for? I wrote a tool to find out. Help build it out!
Aaron Patterson @tenderlove
66K Followers 890 Following Job: @Shopify Opinions: Mine PGP: 4CE9 1B75 A798 28E8 6B1A A8BB 9531 70BC B4FF AFC6 Partner: @ebiltwin and cats. he/him @[email protected]
Kent Beck 🌻 @KentBeck
184K Followers 842 Following Programmer, coach coach, artist, pokerist, singer/guitarist. Learning to be me. Blogging at https://t.co/x9OAJDl8v9. Mastodon: @[email protected]
Charity Majors @mipsytipsy
81K Followers 586 Following honeycomb, observability, the second edition of "Observability Engineering" is coming out soon. find me on substack, bsky, LI, and occasionally here. 🐝🏳️🌈🦄
PragmaticProgrammers @pragprog
27K Followers 295 Following Technical excellence from a trusted friend and the highest author royalties around. We are pragmatic, and we are developers, for developers.
Jessica Kerr @jessitron
34K Followers 2K Following Symmathecist, @honeycombio. she/her Tweets are mine, license CC0. It is not about me.
Avdi Grimm @avdi
19K Followers 982 Following Head Gardener, @gracefuldotdev Fediverse: https://t.co/qdP68TT6i3
Nate Hopkins @hopsoft
6K Followers 2K Following Husband, Dad, Software Writer, Maker. Creator of several Ruby, JavaScript, and (soon) Elixir open source libraries - personal views only.
Tim @timheuer
30K Followers 723 Following 👨💻 Developer Experience at Microsoft / 🚴♂️ Cyclist @timheuer everywhere
Maurício Aniche @mauricioaniche
12K Followers 4K Following CTO @ Alura, ex-{Uber, Adyen, TU Delft, Locaweb}, author of https://t.co/WUAKj72qHb, once in top 20 list of most prolific young researchers in SE
Scott Chacon @chacon
16K Followers 1K Following CEO of @gitbutler, cofounder of @SCNE_io, previously cofounder of @github.
Kakutani Shintaro @kakutani
9K Followers 2K Following Plain Old Rubyist-ist, XPer, Señior Organizer of RubyKaigi🎭, co-founder of KeebKaigi🌈⌨️🧟♂️ -- I'm trying to survive in Social Network Zombie Apocalypse
Brian P. Hogan @bphogan
9K Followers 1K Following Technical content expert, developer education leader, author, educator, mentor, and software developer. I develop people, content, and code. He/Him.
Evan Phoenix @evanphx
7K Followers 1K Following Startup CEO at Miren. "Who knew your inability to shut up would prove so useful?" -- https://t.co/gvFs9FnLVt
schwad @schwad_rb
3K Followers 1K Following rubyist | https://t.co/XaWguA5eG0 | job: @zardotapp | former: @shopify @chef | opinions: mine | https://t.co/HH0mjtkOr9 💧
Chris Seaton @ChrisGSeaton
4K Followers 2K Following Researcher at @Shopify // PhD in Ruby // Founder of @TruffleRuby // Squadron Leader of the Cheshire Yeomanry 🦊
mike dalessio @flavorjones
4K Followers 2K Following 🐘: @[email protected] 🦋: @flavorjones.bsky.social 🧵: @flavorjones111
Andrew Mason @andrewmcodes
5K Followers 2K Following Writing @rails at @podia 🦄 | @remote_ruby 🎧 | #AZ 🌵
Collin @collin_jilbert
3K Followers 1K Following Does Ruby things @gorails, @hatchboxio, and @jumpstartrails | Skateboarder | Drummer | Co-editor @therubyradar
Sarah becton @Sarahbecto5qtx2
21 Followers 714 Following I'm a simple girl, like to play and that is available for in call and out call for a nice memorable time.
Danilo Araújo @dtharssisaraujo
28 Followers 273 Following
Carles Andres @carlesandres
311 Followers 381 Following Software engineer. Building and tinkering. I go to bed early.
Lucas @luke_sequeiraa
0 Followers 62 Following
nico piderman @namredip
700 Followers 1K Following I like Elixir and Erlang/OTP. He/him. BLM. https://t.co/7lihI6bw0I
Hoang Vu @LersonV13
9 Followers 115 Following
Zombie @MaxRostotski
28 Followers 373 Following Entrepreneur | Software Engineer | Elixir | Ruby on Rails
rghiggi @rghiggi_
86 Followers 15 Following
Makarov Le Grand ! �... @MkrovTheGreat
692 Followers 1K Following i'm igor pachmelnik zakuskov and i'm an инженер , I do Aye Aye with Elixir .
Christopher Stone @christopherast
7 Followers 197 Following
Holsee @holsee
610 Followers 190 Following 🌞 Principal Engineer building EdTech · AI platforms x BEAM 🌚 MicroSaaS fiend · OSS shipper 🍻 BelfastElixir · BelfastFP
Denis @nuculabs
60 Followers 1K Following Passionate Software Engineer, Hobby photographer 📷, Tech Blogger 👨🏻💻
Λlchemistocrat @alchemistocrat
65 Followers 700 Following Cogito, ergo sum incertus | DADA professor @Hogwarts
Wellington Avelino @wellavelino
409 Followers 502 Following Interested in AppSec, Engineering, Testing, BuildTools and CrossFit. Staff Software Engineer https://t.co/sFXJbtVaTf
Daniel Lüning @DanielLuning
1 Followers 187 Following
David Weinstein @insitusec
3K Followers 6K Following security, binary analysis, startups, AI Things… CTO @NowSecureMobile
Mike Hostetler // Chi... @mikehostetler
8K Followers 1K Following Founder, Elixir Builder, AI Agent Architect Obsessed with shipping code, crafting (bad) Girl Dad Jokes, and mastering founder fitness + mindset
Chikahiro Tokoro @chikahirotokoro
102 Followers 159 Following Software Engineer / Traveller / live in 🇩🇪 from 🇯🇵 / Opinions are my own. japanese account is @kibitan
PatRick @patrick_hebner
19 Followers 120 Following
Jose Naranjo @pa1d0s
146 Followers 2K Following
Carmine Paolino @paolino
2K Followers 648 Following Building @chat_with_work and https://t.co/cHpUMkArmR | Previously @freshflowai, @turinginst & others | Produces music as Crimson Lake
Pietro Loffredi @pitloffredi
580 Followers 5K Following Software architect. Multi-platform developer. Committed to become a FP alchemist #Scala #Elixir. Passionate lifelong learner
magiknono @magiknono
918 Followers 3K Following Love Innovation and startup. Perso account to monitor internet and human conversations. linux freelance
rayding @dinglei2008
1 Followers 73 Following
Rui Ferrão @ruipferrao
214 Followers 1K Following Surfing, Running, Cycling and spreading the passion for coding 🏄♂️🏃♂️🚴💻 Strong believer in Capitalism and free market economy 📈
Daniel Russo @_dvrusso
99 Followers 234 Following
Magnus F. Glendrange @mglendrange
35 Followers 623 Following
Lucas Duane Pimenta @LucasDuane
44 Followers 231 Following
Guillaume @paquetgp
14 Followers 449 Following
Ali @shishini
296 Followers 3K Following ★ Logic is good ★ 🇪🇬 🇨🇦 ★ Fédéraliste ★ Centriste ★ Decentralization is good ★ #GetYourPoppy
Andreas Ronge @ronge_ai
1 Followers 60 Following Researching agentic frameworks using Lisp and Elixir, https://t.co/UuzhYFrQFS
Shay Fadida @FadidaShay
0 Followers 20 Following
Michael Park @migrap
64 Followers 952 Following CEO of https://htmx․org | Does it bother anyone else that someone else has your name?
Abhik @Ryecatcher
17 Followers 4K Following
Bartek Pranczke @bpranczke
225 Followers 782 Following I’m curious about anything that makes progress sooner. Father of 👧🧒. 🌍🇪🇺🇵🇱/ 🚀 https://t.co/I5KMZyr6jd
Gorazd Kovačič @gorazdk
33 Followers 212 Following
Jean Lucas Lima @aleattorium
2K Followers 4K Following Systems should be explainable, including software.
Omar A. Alani @omarluqq
35 Followers 443 Following Founder & CEO @ZuneshaAI Building Infrastructure for the Agentic Era join the wait list 👉 https://t.co/4WLZYn4A7s
Dave Lucia @davydog187
3K Followers 1K Following CTO @tvlabs 📺 Technical Advisor @treasury_app Organizer @empexco @elixirnyc🍍🍍🍍🍍🍍 I RTFM
Emil @emilsjoblom
291 Followers 976 Following
DHH @dhh
679K Followers 195 Following Father of three, Creator of Ruby on Rails + Omarchy, Co-owner & CTO of 37signals, Shopify director, NYT best-selling author, and Le Mans 24h class-winner.
Aaron Patterson @tenderlove
66K Followers 890 Following Job: @Shopify Opinions: Mine PGP: 4CE9 1B75 A798 28E8 6B1A A8BB 9531 70BC B4FF AFC6 Partner: @ebiltwin and cats. he/him @[email protected]
Nate Berkopec @nateberkopec
30K Followers 100 Following Ruby and Rails applications, made fast. 日本語: @nateberkopec_ja
Kent Beck 🌻 @KentBeck
184K Followers 842 Following Programmer, coach coach, artist, pokerist, singer/guitarist. Learning to be me. Blogging at https://t.co/x9OAJDl8v9. Mastodon: @[email protected]
Gary Bernhardt @garybernhardt
45K Followers 115 Following Execute Program (learn programming tools quickly); Destroy All Software (dense programming screencasts); formerly Deconstruct conference.
Xavier Noria @fxn
12K Followers 531 Following Everlasting student · Rails Core · Zeitwerk · Freelance · Life lover
José Valim @josevalim
55K Followers 94 Following Creator of @elixirlang. Chief Adoption Officer at @dashbit, where we build https://t.co/FK8F4URbVG and https://t.co/xncEVrvWml.
Charity Majors @mipsytipsy
81K Followers 586 Following honeycomb, observability, the second edition of "Observability Engineering" is coming out soon. find me on substack, bsky, LI, and occasionally here. 🐝🏳️🌈🦄
PragmaticProgrammers @pragprog
27K Followers 295 Following Technical excellence from a trusted friend and the highest author royalties around. We are pragmatic, and we are developers, for developers.
Jessica Kerr @jessitron
34K Followers 2K Following Symmathecist, @honeycombio. she/her Tweets are mine, license CC0. It is not about me.
Avdi Grimm @avdi
19K Followers 982 Following Head Gardener, @gracefuldotdev Fediverse: https://t.co/qdP68TT6i3
Charles Oliver Nutter @headius
14K Followers 213 Following JRuby guy, Java, Ruby, OSS business liaison. Find me: @[email protected] or @headius.bsky.social Sponsor me: https://t.co/G5oUTdTJqA
Tim @timheuer
30K Followers 723 Following 👨💻 Developer Experience at Microsoft / 🚴♂️ Cyclist @timheuer everywhere
Dr Nic @drnic
11K Followers 492 Following
Scott Chacon @chacon
16K Followers 1K Following CEO of @gitbutler, cofounder of @SCNE_io, previously cofounder of @github.
Kakutani Shintaro @kakutani
9K Followers 2K Following Plain Old Rubyist-ist, XPer, Señior Organizer of RubyKaigi🎭, co-founder of KeebKaigi🌈⌨️🧟♂️ -- I'm trying to survive in Social Network Zombie Apocalypse
Evan Phoenix @evanphx
7K Followers 1K Following Startup CEO at Miren. "Who knew your inability to shut up would prove so useful?" -- https://t.co/gvFs9FnLVt
Ufuk Kayserilioglu @paracycle
2K Followers 782 Following Physicist turned software dev turned eng mgr and back to dev. Current: Senior Staff Engineer on the Ruby and Rails Infrastructure team at @ShopifyEng
Phoenix @PhoenixTrade
33K Followers 3 Following Solana’s on-chain perpetuals exchange. Live in private beta.
Jay Van Bavel, PhD @jayvanbavel
66K Followers 2K Following Psychology Prof @NYUPsych | Author of @PowerOfUsBook (https://t.co/bG3QVlNURs) | Director of NYU Center for Conflict & Cooper | Keynote Speaker @TheLavinAgency
Carmine Paolino @paolino
2K Followers 648 Following Building @chat_with_work and https://t.co/cHpUMkArmR | Previously @freshflowai, @turinginst & others | Produces music as Crimson Lake
Wintermute Ventures @wmt_ventures
7K Followers 107 Following Wintermute Ventures is an investor dedicated to supporting innovation in the blockchain ecosystem.
Jonas Kristensen @Jonaskristensen
2K Followers 645 Following Head of Wintermute Ventures @wmt_ventures | Prev: PE with focus on financial services @Permiranews. Dane 🇩🇰 Not fun enough to shit post.
ARIA @ARIA_research
17K Followers 56 Following Advanced Research + Invention Agency. Empowering scientists to reach for the edge of the possible.
Dev Agrawal @devagrawal09
14K Followers 2K Following He/Him Content Creator Core team, @solid_js Core team, @ripple_ts https://t.co/bqdpqbhC3v https://t.co/TyM2hVenFb
Stablecore @Stablecores
611 Followers 1 Following Unlocking stablecoins and digital assets for banks and credit unions
Re @re
127K Followers 724 Following Onchain capital for real-world risk. Stewarded by the Resilience Foundation.
mrs kzg.eth née kass... @kassandraETH
6K Followers 3K Following married to a certain polynomial commitment scheme
Brian Fabian Crain @crainbf
15K Followers 1K Following retired entrepreneur. previously co-founder and ceo @chorusone (acq by @bitwise). co-host @epicenterbtc & investing @frachtisvc
Julia Schottenstein @j_schottenstein
4K Followers 857 Following Building @LangChain | ex-product @getdbt | angel investor 👼 | @Stanford CS engineer | NYC native + SF transplant | runner (sometimes) | https://t.co/QuVTU4GU8U
Anton Babenko 🇺�... @antonbabenko
5K Followers 664 Following @compliancetf / @weeklytf / https://t.co/Vc9f4Hxe06 / AWS Hero / Terraform influencer 🇺🇦🇳🇴
Cycles @cyclesmoney
5K Followers 30 Following Private, open clearing & settlement for individuals, businesses, and trading firms. Send, receive & earn privately with Cycles Pay today.
Frachtis @frachtisvc
2K Followers 13 Following Crypto-native pre-seed fund. Thesis-led, technically grounded. We back founders with belief, clarity & craft before it’s obvious.
Armin Ronacher ⇌ @mitsuhiko
79K Followers 896 Following Creator of Flask. Building at https://t.co/uGuzfu0LKT. Bypassing Permissions. Can hand crank. Husband and father of 3 — “more nuanced in person”
ether.fi Ventures @etherfi_VC
2K Followers 19 Following Backing pioneers who redefine the digital frontier with bold ideas.
勾 @colludingnode
10K Followers 4K Following neurotypical, rabblerouser, aspiring cryptographer working on https://t.co/E6ZRLEaj4v | opinions are my own
cyp.eth @0xcyp
6K Followers 4K Following lead @StatusL2: gasless privacy + native yield for humans & bots // linea consortium janitor // ethereum validatooor // ceci n'est pas un cypherpunk
David Wells @DavidWells
11K Followers 1K Following Fullstack dev. Writing https://t.co/DiwV1jc4Mw & building https://t.co/rLboZAvqqf @Netlify, @goServerless, @Mulesoft, @VendiaHQ & @HubSpot alum Have fun & build awesome.
Will Jamieson @WillJamieson93
6K Followers 2K Following Big fan of software and all things Hoosiers. Built multiple consumer apps used by millions of people.
Zain Shah @zan2434
20K Followers 3K Following teaching machines @southpkcommons previously: @samsung @opendoor @openai @ycombinator S13
Liad Yosef @liadyosef
7K Followers 2K Following Solving human agentic interactions ✨ building @oradotai • co-creator MCP Apps • https://t.co/7zT1k5lzOE • https://t.co/XqSWnmvTqM • prev @Shopify • astronaut @Oewf 🚀
yenkel @yenkel
10K Followers 695 Following vp r&d @okta (@auth0lab), og @auth0 🚀 startup advisor, investor. 🛠️ 0 to 1. ❤️ to scale things. 🏀 fan
Brian Long | Devil's ... @brianlong
7K Followers 4K Following Entrepreneur located in Boulder, CO. I write limericks and make Blockchains work better. https://t.co/tmyhyznbi6 #Solana #Wormhole #Pyth #Sui #LeanStartup
André Beganski @andrebeganski
2K Followers 3K Following Staff Reporter @decryptmedia | Product of @CUNY and @djnf | email: [email protected], tg: andrebeganski
Daniel @DanielGKuhn
6K Followers 3K Following Writer, editor @TheBlockCo [email protected] @danielgkuhn on TG
Yueqi Yang @Yueqi_Yang
8K Followers 2K Following Crypto reporter @theinformation. Ex-Bloomberg. [email protected]. Verify my X account from my official author page.
Hannah Lang @hannahdlang
5K Followers 2K Following Covering fintech and crypto for @Reuters. Enjoys scoops of both ice cream and news. Send either to: [email protected]. DM for Signal
Niamh @niamhrowe7
753 Followers 958 Following tech + money @guardian @verge @observerUK @wired @gq @dazed @thedailybeast / formerly @ft @fortunemagazine
Sam Kessler @skesslr
8K Followers 1K Following Investigations + Data @WSJ || sam.kessler(at)https://t.co/oBkB762h5N || Signal available on request || @Skesslr on TG || (Tips 👍, PR 👎)
Vicky Ge Huang @Vlajournaliste
6K Followers 2K Following Markets Reporter @WSJ covering crypto and retail investing. Voracious reader. Views my own.
Nina Bambysheva @ninabambysheva
8K Followers 1K Following Deputy editor @Forbes leading crypto coverage
Jordan Smith @JordanCNBC
412 Followers 144 Following Producing @CNBC Crypto World every Monday-Friday.
Muyao @MuyaoShen
10K Followers 943 Following magic money on the Internet @crypto via @business | tweets are my own and mostly about food | mshen118 (at) bloomberg dot net
Brady Dale @BradyDale
15K Followers 1K Following Author of Front Stage Exit. Subscribe: 👇 // Journalist // Wrote the book 'SBF' // Always throws paper.
Kenan Saleh @kenanhsaleh
5K Followers 1K Following Investment Partner @a16z. Previously: GM @Lyft, Founder @HaloCars (acq by Lyft), @Penn @Wharton
KNOX @0xKnoxFi
12K Followers 163 Following Building scalable low risk DeFi. A universal wrapper turning volatile markets into structured, capital efficient products for institutions & yield seekers.

























