Google SRE: - rounds. Coding, Linux internals, NALSD (Non-Abstract Large System Design with concrete resource estimation), and behavioral. High bar.
Amazon: - rounds. Every round includes Leadership Principles. System design, coding, and operational scenarios.
Meta Production Engineering: Coding (practical scripting), systems (OS concepts), and behavioral. Focus on scale.
Startups: - rounds. Often faster process. More generalist expectations. May include take-home or pair programming.
Research your target company's specific format. Interview structures vary widely even within the same role title.