# Build, Launch & Scale Your Startup with Aslam Sarfraz

> Many AI-built MVPs work perfectly during demos but struggle in production. Book a free 30-minute session to review your application's architecture, scalability, security, and operational readiness before growth exposes hidden problems. Get practical advice on how to avoid outages, slow performance, and expensive rebuilds as your user base grows. This one ties directly to the LinkedIn post and creates curiosity.

- Host: Aslam Sarfraz
- Duration: 30 min
- Location: Cal Video
- Host time zone: America/New_York
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/aslamsarfraz/30min
- Event type id: 5169841

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5169841&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": 5169841,
  "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.