Cal.com

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[Cal.com @calcom]

https://t.co/BBfD1INJKF now available under MIT — for hobbyists, builders and self-hosters

Use at your own risk. Free forever.

Use https://t.co/oBpdVL4YGC for any hosted production environment.

[Bailey Pumfleet @pumfleet]

Open source is dead.

That’s not a statement we ever thought we’d make.

@calcom was built on open source. It shaped our product, our community, and our growth. But the world has changed faster than our principles could keep up.

AI has fundamentally altered the security landscape. What once required time, expertise, and intent can now be automated at scale. Code is no longer just read. It is scanned, mapped, and exploited. Near zero cost.

In that world, transparency becomes exposure. Especially at scale.

After a lot of deliberation, we’ve made the decision to close the core @calcom codebase.

This is not a rejection of what open source gave us. It’s a response to what risks AI is making possible.

We’re still supporting builders, releasing the core code under a new MIT-licensed open source project called cal. diy for hobbyists and tinkerers, but our priority now is simple:

Protecting our customers and community at all costs.

This may not be the most popular call.

But we believe many companies will come to the same conclusion.

My full explanation below ↓

[Cal.com @calcom]

We are hiring for a Head of Product and a Product Designer

but you can only apply in pairs 👇

[Peer Richelsen @peer_rich]

++ HIRING ++

we are trying something new

@calcom is hiring you and your cofounder

1. one role for head of product and one product designer who can hustle
2. we can acqui-hire (signing bonus and equity) and help sell assets (within reason)
3. if your startup gone to shit our lawyers can help shut it down for you
4. you must have worked together for at least 3 years, ideally managed employees
5. only apply in pairs. we reject individual applications
6. remote works, with office preferences new york or northern germany
7. comment or email [email protected] to apply, send both CVs

[Cal.com @calcom]

If it's worth yapping about, it's worth a Cal link.

[Bailey Pumfleet @pumfleet]

Tomorrow night, we're hosting https://t.co/m3l8snm5N9

A cafe listening room for friends of Cal to escape the tech week panels, pitches, and badges.

Drinks, bites, and a room that takes their mission seriously, and selves unseriously.

Come solo, come with friends, leave with new ones.

Limited capacity, RSVP at https://t.co/m3l8snm5N9

[Cal.com @calcom]

A weird thing happens at growing companies:
- They’ll spend $100k/month on demand gen.
- Then route a $1M opportunity through the same process as a newsletter signup.

That’s not a lead routing problem. That’s a prioritization problem.

[Cal.com @calcom]

why long url when short enough

https://t.co/oBpdVL4YGC

[Loki @lokio_aj]

Built a voice agent that can book clinical appointments end to end.

It talks to the user, checks doctor availability via @calcom, finds a suitable slot, and books it.

Used @DeepgramAI for STT/TTS and Gemini 3.1 Flash Lite.

Repo: https://t.co/iWZdAYJ6vj

[Cal.com @calcom]

One of our favorite startup problems:

Needing more people.

[Bailey Pumfleet @pumfleet]

Nobody is hiring.

At least that's what we're told every week.

Somebody should probably tell our hiring team.

We're hiring across GTM, Engineering, Foundation, Growth, and Design:

- Social Growth Lead
- Brand/Visual Designer
- Copywriter
- EA to Head of GTM
- Videographer
- IC3 Security Engineer
- IC4 Scale Engineer
- IC4 Senior Full-Stack Engineer

[Cal.com @calcom]

The most expensive part of your funnel isn’t acquisition.
It’s what happens after someone raises their hand.

[Cal.com @calcom]

A lot of people don’t realize you can actually charge for your time directly through @calcom .

[Bandhan Majumder @MEbandhan]

Excited to share that I have joined @calcom as a Software Engineering Intern. Looking forward to learning a lot.

Grateful for the opportunity 🙏❤️

[Cal.com @calcom]

still waiting 🕒

[Cal.com @calcom]

@levelsio @martindonadieu name a bug

will fix <24 hours

[Cal.com @calcom]

Scheduling isn’t just an HR/Ops thing.

It has reduced time-to-lead 50% and close rates 2x for the GTM teams @calcom supports.

Here's how:

[Sean brydon @SeanBrydon13]

Has anyone noticed i made the @calcom auth background simulate the sun across the world map?

@emilkowalski I feel like you might like this 👀

[Cal.com @calcom]

Last night we identified an issue where our firewall was blocking requests coming from certain edge servers. We have resolved the issue.

https://t.co/korWPSimT5

[Cal.com @calcom]

@timekeepur we are on it

[Aru @arubhardwaj_]

@peer_rich @calcom i am using Cal diy, it just works great for me and one off automation setup then we were all good

[Cal.com @calcom]

We are unaffected by the TanStack supply chain attack.

[Cal.com @calcom]

This nice-looking t-shirt is everywhere.

[Guillermo Rauch @rauchg]

SF calisthenics club

[Rick Pastoor @rickpastoor]

The @calcom CalDAV integration works seamlessly together with Cirrux 💜

Let Cirrux handle your email and calendar and use https://t.co/MIX9Ci4zYM to let folks book time and schedule meetings

Docs here: https://t.co/qqb0QSh5gt