# Collective Engineering – Cal.com booking page

> Book a meeting with Collective Engineering on Cal.com.

Booking page: https://collective.cal.com/ca-eng-calls

## Event types

- [Test Calendar](https://collective.cal.com/ca-eng-calls/intro-call-with-marco): 15 min, confirmed instantly, event type id 7702985. Details: https://collective.cal.com/ca-eng-calls/intro-call-with-marco.md
- [15 min meeting](https://collective.cal.com/ca-eng-calls/15min): 15 min, confirmed instantly, event type id 4657234. Details: https://collective.cal.com/ca-eng-calls/15min.md
- [30 min meeting](https://collective.cal.com/ca-eng-calls/30min): 30 min, confirmed instantly, event type id 4657232. Details: https://collective.cal.com/ca-eng-calls/30min.md

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=<event type id>&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

Each event type's `.md` document lists its required booking fields and the `POST https://api.cal.com/v2/bookings` request (`cal-api-version: 2026-02-25`).

## More

- API docs: https://cal.com/docs/api-reference/v2/introduction