Team lead manages the overall direction of the team (and is possibly the expert on some portions), but for an individual subsystem a senior engineer might be the expert.
For work coming from outside the team, it’s sort of upto your management chain and team lead to prioritise. But for internally driven work (tech debt reduction, reliability/efficiency improvements etc) often the senior engineer has a better idea of the priorities for their area of expertise.
Prioritisation between the two is often a bit more collaborative and as a senior engineer you have to justify why thing X is super critical (not just propose that thing X needs to be done).
I view the goal of managers + lead as more balancing the various things the team could be doing (especially externally) and the goal of a senior engineer is to be an input to the process for a specific system they know most about.
For work coming from outside the team, it’s sort of upto your management chain and team lead to prioritise. But for internally driven work (tech debt reduction, reliability/efficiency improvements etc) often the senior engineer has a better idea of the priorities for their area of expertise.
Prioritisation between the two is often a bit more collaborative and as a senior engineer you have to justify why thing X is super critical (not just propose that thing X needs to be done).
I view the goal of managers + lead as more balancing the various things the team could be doing (especially externally) and the goal of a senior engineer is to be an input to the process for a specific system they know most about.