5 rounds:

• Call with HR for fit
• High-level Data Design Call with Data Engineering Manager (asks you about a design for a data application you've built in the past)
• 1-hour Coding interview (related to datetimes and finding best events given constraints)
• 1-hour System Design (design a data pipeline)
• 1-hour final team meeting

Study the datetime library, and make sure you ask system design requirements early.