I think the responsibilities of project coordinator / project manager can be a part of the work of senior IC (Principal Engineer) or someone like Agile Coach, D

I think the responsibilities of project coordinator / project manager can be a part of the work of senior IC (Principal Engineer) or someone like Agile Coach, Delivery Lead. Recently, I was a Chief Architect - an IC role - and organised and drove cross-team initiatives was a part of my work. It is not an easy skill, it needs practicing and the work is time consuming, may not be a fun quite often, but I think you do not absolutely have to assign it to a manager.