
Keith Williams
@keithwillcode
Head of Engineering @calcom
The infra building has only just begun. What a way to start with Origin UI and @pacovitiello
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…
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

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.

We're hiring a Senior Software Engineer to join our team building Atoms and APIs used to book tens of thousands of meetings per month. Interested? cal-com.breezy.hr/p/3095a3ff2ca6…
As our 4th internship cohort enters its final week, want to thank @DevanshuXi and @kart1kk for reviewing 275 PRs over the last 4 months. Epic! Also, be on the lookout for a new page on cal.com soon where you can apply for February's cohort.
Nice functionality in VS Code. find: trpc\.([a-zA-Z0-9]+)\.([a-zA-Z0-9]+).([a-zA-Z0-9]+)\.useQuery replace: $1.$2.queries.$3.useQuery I still love you, regex.
Studying some Japanese and reminded of how amazing it is to put a smile on someone’s face when you speak their language and understand their culture, even just a little. Let’s not lose this completely to AI. 🙏🏼

Highly recommend using @DevinAI in Slack so your whole team can see each other work. Local AI agents are great, of course, but this helps with cross-team learning, brainstorming, visibility, etc.
Work has begun on incorporating trigger.dev into our app to replace our current tasker. Fallback options for self-hosters will still be available and we plan to build this with the intention of easily swapping other queuing systems in/out.
Have seen lots of engineers avoid writing automated tests because they aren’t fun or “they slow us down”. With AI, there’s no reason to not have incredible test suites, even for small startups. Our output has doubled over the last year since we put quality first.
Was looking at data recently and just wanted to say thanks to open source contributors. You all rock.

New blog up about perf optimizations for slot calculation logic (more code clean up and improvements coming). cal.com/blog/finding-a…
cal.com
Finding and Fixing O(n²) Performance Bottlenecks: Real Algorithm Optimizations at Cal.com | Cal.com...
Discover how Cal.com identified and resolved O(n²) performance bottlenecks in its scheduling platform. Learn proven techniques for detecting, optimizing, and preventing slow algorithms with real-wo...
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