# Hasibul Hasan – Cal.com booking page

> Senior Full-Stack Developer and SaaS Founder with experience building scalable products, AI-powered applications, and cloud-based systems.

I help startups and businesses validate ideas, design architectures, and ship production-ready software.

Let's discuss your next product, technical challenges, or growth opportunities.

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

## Event types

- [15 min meeting](https://cal.com/hasib/15min): 15 min, confirmed instantly, event type id 5800836. Quick Intro Call A short meeting to discuss your project, idea, technical challenge, or collaboration opportunity. This call is best for: • Initial introductions • Quick technical questions • Project feasibility discussions • Exploring potential collaboration • Determining next steps Please include a brief description of what you'd like to discuss when booking. Details: https://cal.com/hasib/15min.md
- [30 min meeting](https://cal.com/hasib/30min): 30 min, confirmed instantly, event type id 5800835. Consultation & Project Discussion A focused session to discuss your product, technical requirements, architecture, AI integration, SaaS development, or business goals in more detail. This meeting is ideal for: • SaaS product planning • MVP strategy and validation • System architecture reviews • AI implementation discussions • Technical consulting • Custom software development projects To make the most of our time, please provide relevant details about your project, goals, and any specific challenges you'd like to address. Details: https://cal.com/hasib/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