Keith Williams @keithwillcode
Head of Engineering @calcom linkedin.com/in/keithwillco… Earth Joined January 2011-
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Big congrats to the @useblacksmith team. They’ve built really nice systems for CI. Crazy fast cache and sticky disks alone can knock off huge % of your CI wall times. Definitely recommend.
@sequoia is leading our Series C at a $1B valuation. We started Blacksmith in 2024 to make CI faster and less painful. In January we ran 5 million CI jobs a week. Today it's over 90 million and growing, and we’re still early.
@andreaskruszaki @calcom @uixmat @SeanBrydon13 @pacovitiello Hell yeah. Excited for you to join.
Pasquale always unreal
Just dropped a new set of chat UI components 💬 coss.com/ui/chat
AI is reshaping software engineering into two increasingly distinct paths: product engineers focused on what to build and why, and foundational engineers focused on the deep systems, infrastructure, security, and scale that make it possible. As AI handles more of the "how," engineers will have to decide where they want to create the most impact.
99.92% uptime this year. Highest we've ever had at @calcom , by far. We could ship faster and let users eat the bugs. Some big names in our space do exactly that. But that's just not how we roll anymore. If people are relying on us to run their scheduling, it has to actually work. In fact, I want this number to be 99.99% soon.
@kurtkalwin @calcom We had a couple lapses in internal processes for reviewing heavy DB hits and firewall changes. Those have since been rectified.
Happy to see this. We are in a time of transition and the code does still matter.
There will come a time when how code is written won't matter. But for now, I still care that the code looks and reads right. I'm not ready to let go :)
There will come a time when how code is written won't matter. But for now, I still care that the code looks and reads right. I'm not ready to let go :)
I still spend a LOT of time figuring out the right abstractions and interfaces (user and programming). I recently built two components for shadcn/react. Each took weeks of UX research, experimentation, and iteration to get right. AI hasn't accelerated this part yet, at least
Order of the Sinking Star is such an unreal puzzle game
I've always hated "move fast and break things." It's an excuse for not doing the work right. So why are we constantly okay with breaking things? And with AI there's no excuse left.
Great to see this
To secure open-source software, we’re launching OSS Scanner. We’ll use our frontier models to periodically scan opted-in open-source projects for vulnerabilities, at no cost. Our reports will provide a proof-of-concept, explanation, and suggested fix. anthropic.com/research/launc…
I'm a private person. Barely touched social media for years. Then my brother, a robotics professor, convinced me to start posting. After 20 years in this, if I can share something that actually helps another engineer, why wouldn't I? That's the whole point. I just want to teach.
AI can accelerate engineering, but you can't build trust by assuming everyone understands everything it generates. Strong test suites, CI checks, AI and human reviews, and experienced engineers create the guardrails that keep AI-assisted development moving in the right direction, especially for junior teammates still building judgment.
Great leaders don't control every task. They create the space for people to think, challenge, and solve problems creatively. Leadership is about serving your team, being a sounding board, and helping people find the best solutions rather than using the role to control them.
Love this mindset
Frantically fixing a confusing product caused by frantic shipping is just more of the same. Pause and step back. Get the team clear on what you’re building and why. Have clarity to guide the shape, what ships and what doesn’t. Quality is a way of working, not a cleanup sprint.
"Bring me solutions, not problems" is the fastest way to kill trust with your engineers. It teaches them to hide problems or show up with half-baked fixes they're scared to be judged on. So bring me the problem. We'll figure out the solution together. That's the job.
I bet engineering teams who built their systems using DDD are quietly smiling these days as exposing domain capabilities to APIs/MCPs/agents would be a breeze.
Nitish Tiwari @nitisht_
1K Followers 1K Following Founder @parseablehq | Helping teams leverage their telemetry data for better outcomes | Try now at https://t.co/NSdrrjzP7S
Andreas Kruszakin-Lib... @andreaskruszaki
2K Followers 508 Following Award-winning Creative Design Engineer → @calcom time engineer → @spacexai ambassador → @mobbin ambassador
Brook_windy @windy_brook2001
41 Followers 868 Following Member of the Kubeflow CNCF org. Exploring the world of AI Infrastructure, MlOps. Sharing my journey. https://t.co/vjJlNiMZRT
Aniket Pawar @alaymanguy
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Somesh @devsome_sh
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Olle Marmenlind @olle_marmenlind
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Alexander (TOTAL RELO... @alex_TORSHOCK
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aryan @y_aryans
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DB | EXXXOTICA NJ soo... @bno_switch
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Martin Sundeqvist @MaSundeq
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Raghavendra Talur @raghavendra_t
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Nik Rai @__Nik5__
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Black Beard @BlackBeard3370
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Lelouch @Allhaillelouch_
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Ridwan Taiwo @donriddo
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lol kao @lol_kao
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Vismay Vora @voravismay9
130 Followers 4K Following Curious & always seeking insights| Focused on excelling daily| SWE @Bloomberg | ex-AI Consultant @sunyrf | MSCS @stonybrooku| Smart India Hack '22 Winner
Karthik Ram @Aipmworld
69 Followers 2K Following Product @TikTok_Us - AI & Content Safety. CMU Alum ⚓️ | Ex-@Razorpay. Optimist. Here to learn
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randomposter @bannerman165
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danish mehmood @danish__mehmood
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Jaswanth Sriram @jaswanth_sriram
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Alakh Naik @fcolty
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Tarun @TarunAwsom28989
62 Followers 1K Following full time builder | working and building around voice agents,ai backend & memory https://t.co/ZKUiTPsDsi
Cloudflare @Cloudflare
321K Followers 5K Following Cloudflare is the world’s leading #ConnectivityCloud, and we have our eyes set on an ambitious goal — to help build a #BetterInternet.
Dhairyashil @dhaiiryashiil
2K Followers 372 Following software engineer | previously - @calcom | gsoc’25, 26 @RocketChat
Lee Robinson @leerob
299K Followers 892 Following Superintelligence at SpaceX. Previously Cursor and Vercel/Next.js. Helping build and teach the future.
Matt @uixmat
4K Followers 403 Following Head of Product ∗ https://t.co/SQRAEiZj7g Creator of https://t.co/PVi0bcSQRx
Trigger.dev @triggerdotdev
9K Followers 104 Following Build and deploy durable AI agents and workflows. → https://t.co/glJGy69WV0 → https://t.co/TJuSGuixlj → https://t.co/v5HnGSxBNb
Peter Grandich @PeterGrandich
24K Followers 101 Following Part of a financial planning group in Wall, NJ, blogger and podcaster https://t.co/83329J2UYi https://t.co/gW5R0QBFvV
Cal.com @calcom
19K Followers 170 Following Tired of email tennis when scheduling meetings? https://t.co/MOuhlAEdpW is a powerful scheduling platform. It's fully customizable, feature-rich, & privacy-first.
Martin Fowler @martinfowler
358K Followers 160 Following Author on Software Development. Works for Thoughtworks. Also hikes, watches theater, and plays modern board games. He/him.
Matthew Prince 🌥 @eastdakota
349K Followers 299 Following A little bit geek, wonk, and nerd. Repeat entrepreneur, recovering lawyer, and former ski instructor. Co-founder & CEO of Cloudflare (NYSE: NET).
tRPC.io 🧙♂️ @trpcio
29K Followers 5 Following Move Fast and Break Nothing. E2E typesafe APIs without schemas nor build steps. 🌟 35,000+ 💬 https://t.co/xtoowqMBH8 🤓 https://t.co/aqeZ3i6adD
Blacksmith @useblacksmith
8K Followers 11 Following The fastest way to run your GitHub Actions. Trusted by @supabase, @trychroma, @clerk and 10000+ others.
Cloudflare Developers @CloudflareDev
84K Followers 144 Following Have questions, or building something cool with Cloudflare's Developer products? We're here to help. For help with your account please try @CloudflareHelp
Jared Palmer @jaredpalmer
113K Followers 3K Following vp of engineering @cognition. building @devinai. previously: vp product @microsoft. vp of ai @vercel. founder of @turborepo (acquired by vercel).
Garry Tan @garrytan
1.1M Followers 6K Following President & CEO @ycombinator —Founder @garryslist—Creator of GStack & GBrain—designer/engineer who helps founders—SF Dem accelerating the boom loop
Mads Kristensen @madskristensen
35K Followers 699 Following Working on Visual Studio, founder of https://t.co/ivj6P48rU4, VS extension author, and home automation enthusiasts.
Oleg Kyrylchuk ✙ �... @okyrylchuk
17K Followers 664 Following I write about @dotnet Help for Ukraine https://t.co/RThb4b9MGS or https://t.co/Vu9bTo0s69
Scott Hanselman 🌮 @shanselman
336K Followers 10K Following VP, Member of Technical Staff @ MSFT/GitHub - Code, OSS, STEM, Beyoncé, T1D, #DevRel YouTube/TikTok and listen to the @Hanselminutes tech podcast
Zach Waterfield @zlwaterfield
4K Followers 2K Following 🧑💻 Building https://t.co/Hpurk7uSHq, https://t.co/KsiELAEwtm, prev @posthog 💸 @pioneer_fund/@ripple_ventures 🏫 @UWaterloo 🤌 Searching for taste
Maximilian Kaske 🏓 @mxkaske
3K Followers 772 Following dev · climber · building @openstatushq · call me max
Neuralink @neuralink
1.8M Followers 1 Following Creating a general-purpose, high-bandwidth interface to the brain
coss.com @coss_com
7K Followers 7 Following the beautiful open source design system by @calcom built on top of @base_ui and @shadcn CLI
Jimmy Lai @feedthejim
7K Followers 523 Following codex/chatgpt web infra @openai previously: eng director @nextjs @vercel, also @reactnative @meta
Kartik Saini @kart1kk
132 Followers 3K Following Software Engineer at Buildway AI | Prev @calcom https://t.co/t9IHNBvcNT
Next.js @nextjs
296K Followers 15 Following The React Framework – created and maintained by @vercel.
Tim @timneutkens
54K Followers 596 Following @vercel. co-author of @nextjs, MDX, Micro, and ncc. Opinions are my own.
lukesandberg @lukeisandberg
264 Followers 125 Following Engineer @vercel working on Turbopack. “The best code is deleted code”
Prisma @prisma
79K Followers 56 Following Your TypeScript app, from prompt to production npm create prisma@latest 📚 https://t.co/jPVvgllHKl 💬 https://t.co/GSSBwEHTOv
Benny Joo @hbjORbj
890 Followers 591 Following Muay Thai enthusiast from @Yale @EdinburghUni coding, coding and coding
Devanshu @DevanshuXi
5K Followers 978 Following Infra @mastra prev @clockwork_labs @AshibaResearch @calcom databases • distributed systems • Views are my own.
Richard Poelderl @richardpoelderl
762 Followers 1K Following Founder https://t.co/InOEbIoe04, https://t.co/pli3klhKTT & building https://t.co/lLqwO5D1Ez | I help Marketing teams scale & adopt AI.
MS Virtual Academy @MSVirtAcademy
105K Followers 3K Following Thank you to the 3,000,000 developers, IT pros and students who have joined MVA for free online training from Microsoft experts!
Microsoft Learn @MicrosoftLearn
517K Followers 12K Following Empowering everyone to build skills and achieve more through learning. Spark possibility ✨
Microsoft Developer @msdev
530K Followers 49 Following 👇 Join @GitHub Universe in person or virtually and get your pass today.
Nomads.com @nomadscom
44K Followers 3 Following 🌍 Find your people Join a global community of digital nomads living and traveling around the world 💝 Insured by @safetywing by @levelsio
Remote Jobs @RemoteOK
68K Followers 2 Following 🌍 Find a remote job + work from anywhere 💝 Insured by @safetywing 🔔 Job alerts https://t.co/FQ1egAuSNV 👉 Discount https://t.co/GiAO3RHfUl 👉 Bundle https://t.co/mFNcOYBvIC
Visual Studio @VisualStudio
536K Followers 11 Following The most comprehensive IDE for .NET and C++ devs on Windows. It's packed with a sweet array of tools to elevate every stage of software development.
AreaTres Workplace @areatres
6K Followers 5K Following Ofrecemos espacios inspiradores a la medida de tu equipo. 🚀 Somos #TuOficinaIdeal. Orgulloso Partner de @GoogleStartups.
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1K Followers 53 Following An yearly snapshot of (location) #independent workers and their culture. #remoteworkTrends for United States
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