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At xyz, I would look out for people who would make the maximum impact - impact is not just shipping high quality code but also elevating others to higher standards. Would this person step in and help others fix the issues. For e.g. one of my directs - not only got up to speed on ELK and Kafka - she went above and beyond - setting up standards and creating a library so other teams can easily adopt to thier project. She become a SME and the impact was that she had on other teams was 10-15% increased velocity. 

My job was to enable this person to be in the front to help solve their issues all along making impact on the projects she was responsible. This paved way to be promoted to Tech Lead - which is what she aspired.