# Assis Ngolo – Cal.com booking page

> I lead payments engineering at Squire (YC16). Before that I was head of engineering at BVNK (acquired by Mastercard, March 2026). I have shipped three production ledgers, a payfac on direct JPMC rails, a PCI DSS card vault, and a real-time fraud platform. Founder of Nellcorp.com. Find me at assis.ao

Booking page: https://cal.com/assis

## Event types

- [Customer Discovery](https://cal.com/assis/nellcorp): 30, 45, 60 min, confirmed instantly, event type id 6603949. A quick call to see if we're a fit Details: https://cal.com/assis/nellcorp.md
- [15 min meeting](https://cal.com/assis/15min): 15 min, confirmed instantly, event type id 5742606. Details: https://cal.com/assis/15min.md
- [30 min meeting](https://cal.com/assis/30min): 30 min, confirmed instantly, event type id 5742605. Details: https://cal.com/assis/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