How do I hire engineers who raise the bar?

You hire people who make the team better, with a process that sees past the performance to the real engineer underneath. That is a genuine skill, and it compounds, because every strong hire raises the bar for the next. You are not just filling seats; you are shaping what the team becomes. The thing to watch when you are good at this is that a sharp process can quietly narrow into a mold. You get good at spotting a certain kind of strong engineer, and you start hiring more of the same. A team of one type has blind spots no amount of individual talent covers. Raising the bar and widening it are both part of the job. On your next hire, ask what kind of strength your team is currently missing, and weigh it deliberately. Hiring for what the group lacks, not just for who impresses you, is how a high bar stays healthy instead of homogeneous.