4 calls in total:
1. phone screening just asking about requirements and if I have a visa etc.
2. More in depth with the lead of the SE team, asking about skills and about myself, he explained about the company and the software
3. Case Study presentation, it was sent 3 days ahead, I worked on It and then presented it to the lead, it was basic analysis task using python
4. chat with CEO about myself and the company
