# Discovery Call: Architecture Alignment with Francesco Colamonici

> Let's discuss your current system architecture challenges, product scaling roadmap, or how fractional advisory can support your engineering team.

- Host: Francesco Colamonici
- Duration: 20 min
- Location: Cal Video
- Host time zone: Europe/Rome
- Confirmation: The host confirms each booking; it stays pending until they accept it.
- Booking page: https://cal.com/francescocolamonici/discovery-call
- Event type id: 6276180

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6276180&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

```http
POST https://api.cal.com/v2/bookings
cal-api-version: 2026-02-25
Content-Type: application/json

{
  "eventTypeId": 6276180,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "Company-Name": "…",
    "Company-URL": "…",
    "Current-Tech-Stack": "…",
    "Main-Challenge": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email), `Company-Name` (Company Name), `Company-URL` (Company URL), `Current-Tech-Stack` (Current Tech Stack)
- Optional fields: `Main-Challenge` (Main Challenge), `notes` (Notes), `guests` (Guests)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.
- A successful response is a pending booking request.