I'm not an SRE, but for SWEs at that level you may expect a deeper discussion in:
* Addressing scaling bottlenecks with a large focus on reliability and fault-tolerance.
* Concepts orthogonal to the core ask (ex: security, privacy, auth n/z, compliance).
* Cost. Ultimately the most scalable architecture may not be very cost effective; the 2nd best option might be much cheaper and merits discussion.
These are for large scale design questions. Questions to L6 candidates are posed (deliberately) ambiguously to see if they can tease apart the important/finer details.
* Addressing scaling bottlenecks with a large focus on reliability and fault-tolerance.
* Concepts orthogonal to the core ask (ex: security, privacy, auth n/z, compliance).
* Cost. Ultimately the most scalable architecture may not be very cost effective; the 2nd best option might be much cheaper and merits discussion.
These are for large scale design questions. Questions to L6 candidates are posed (deliberately) ambiguously to see if they can tease apart the important/finer details.