Interviewing resource suggestion: level-based system design rubric

Hi Charlax,

I read the interviewing section of Professional Programming and saw the interviewing.io senior system design guide among the resources for candidates: https://github.com/charlax/professional-programming/blob/master/README.md

I am Andy, founder of PracHub. We published a free rubric that breaks down observable system design signals at mid-level, senior, and staff levels, including scope control, technical depth, risk discovery, and communication: https://prachub.com/resources/system-design-interview-rubric-by-level-mid-level-vs-senior-vs-staff

Would you be open to reviewing it as a possible addition to the interviewing section? It is narrower than a full preparation guide: the goal is to help readers evaluate the quality and level of their own practice sessions.

If it is not strong enough for the collection, please feel free to close the issue.

Thanks, Andy Founder, PracHub