# Backend/Cloud-Native Mentorship: Introductory Call with Peter Makafan

> For mid-level developers who want to design more reliable backend systems. We’ll look at where you are now, then cover areas like service boundaries, messaging, data modelling, and operating systems in production. Bring an architecture or code question and you’ll leave with a prioritized learning plan.

- Host: Peter Makafan
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/London
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/makafan/backend-30mins
- Event type id: 1332359

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=1332359&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": 1332359,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `notes` (Additional notes), `guests` (Add guests)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.