I work at a large software company, senior engineers here are essentially technical leads for a team or a subsystem. They are my equals when it comes to level, often getting paid a lot more than me for high performers.

I'm here to help the team make decisions, but I delegate as much of the opinion having to my senior engineers. To have an opinion they need a bunch of inputs, sometimes getting those inputs isn't as natural as the technical inputs, that's where I come in.

Senior engineers are still involved in cross cutting technical concerns but for any work that is bounded by our team I'd be working with them scope out the work as requirements or use cases we give to mid level or early career engineers on the team to disambiguate with the senior engineer as a consult/negotiate.