Keith Williams
@keithwillcode
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Head of Engineering @calcom and @coss_com
Earth
Joined January 2011
Have always been a big fan of underdogs and small teams doing amazing things. If you keep your head down, study hard, work hard and dedicate yourself to your craft, you’ll put yourself in a position for success, regardless of the path you choose to take.
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We reached out to all self-hosters directly but if you have been running any version of https://t.co/C21mZZfk71 yourself, make sure you are updated to https://t.co/uCqaAfBaVw as it contains the patch for the very dangerous RSC vuln.
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While everyone is checking their wrapped music, I’m checking wrapped https://t.co/C21mZZfk71 eng. 3,283 merged PRs 194 releases 266% increase in perf work 123% increase in refactors 28% total output growth Love our team.
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Someone convince me: Now that LLMs can easily write boiler plate code for DB layer crud + help with harder SQL, why would you choose to use an ORM knowing their side effects in terms of perf?
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Don't be afraid to have closed, unmerged PRs on open-source repos if you are exploring. Many times those explorations help you find a better result. I have 119 closed, unmerged PRs on https://t.co/JleUhWymfy and it's all good.
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Having a deep dive with our internship cohort: In the age of AI, what does learning mean to you now that much of the process of getting to the final result is done by AI? I think answering this question is incredibly important to properly continue growing.
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I get asked a lot "what are the most important skills I need to join
https://t.co/oHcsCeaohC?" As a small engineering team doing the work of a team double its size, technical skills are only a part of the story. You have to grind hard, be humble and love autonomy.
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We got hit with a DDoS of about 10 million requests around an hour ago. Fortunately many were blocked by @Cloudflare but the others, although 404s, took up DB resources and crushed our app. Fixes coming soon. Apologies for the disruption.
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Our Docker setup has been ported to our main repo calcom/docker -> calcom/cal.com Looking forward to better supporting this moving forward and to seeing amazing updates from our community. https://t.co/uj362f7LXK
github.com
Summary by cubic Add first-party Docker support with a production-ready Dockerfile, docker-compose stack, and a tag-driven CI that builds and smoke-tests images. Updated README with setup, env vars...
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New blog up about how we'll take learnings from https://t.co/C21mZZfk71 and apply them to https://t.co/Zpga8oKAwf engineering. https://t.co/zUueFcaqnE
cal.com
Explore how engineering at Cal.com is evolving for 2026 and beyond. Learn about our team structure, core principles, and architectural standards to build scalable, high-quality software.
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The infra building has only just begun. What a way to start with Origin UI and @pacovitiello
Origin UI is joining @calcom It’s now @coss_com, a more ambitious project, set to become the best infrastructure for the web We’re already working on the new UI library that will power the platform and remain open to everyone building great UIs Exciting times for open source!
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20 years after almost doing aerospace eng and not computer eng, have come to realize a beautiful link between them: balance. Tests Too few - too risky 100% coverage - pedantic Git Chaotic - hard to collab Extra clean - pedantic Planning Little - confusion A lot - rigidity
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hey 👋 the “large open source Next.js application” is us 😍🥰
We've landed an optimization to Turbopack that improves `next build --turbopack` compile time by 13% Great work by @wSokra
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Just had our biggest month in terms of reviewing and merging PRs on our core team, with team size over the same time period increasing at a much smaller clip. Love to see it.
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