# ☕️ Coffee Chat ☕️ with Hyogeun Oh

> Hi, I'm Hyogeun Oh! 👋 ML Engineer at Toss Securities. I'm into MLOps, LLM inference optimization, and anything GPU-related — vLLM, distributed serving, Kubernetes, that kind of stack. Always happy to chat if you're working on similar problems or just want to exchange ideas. 전문연구요원 관련 고민 있으신 분들도 편하게 연락 주세요! 🙌

- Host: Hyogeun Oh
- Duration: 30, 60 min
- Location: Google Meet, Wangsimni Station, Seongdong-gu, Seoul, South Korea, Yangjae Station, Seocho-gu, Seoul, South Korea
- Host time zone: Asia/Seoul
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/zerohertz/coffee-chat
- Event type id: 2521730

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=2521730&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": 2521730,
  "start": "<UTC ISO 8601 start from the slots response>",
  "lengthInMinutes": 30,
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (What is this meeting about?)
- 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.
- `location` is optional; without it the booking uses the event’s first location.
- `lengthInMinutes` picks one of 30, 60; pass the same value to the slots request as `duration`.