Groundplane is a two-person studio that owns those seams. Founder Andrew Douglass was an integration engineering manager at SpaceX: Falcon stage avionics test, pad electrical, Starlink and GEO payload integration, fairing refurbishment. Integration is the work of making the whole vehicle ship, not any one piece of it.
For specialty work in industrial design, firmware, web, and mobile, we bring in senior people we've shipped with before. Every project has a senior owner on every discipline. No juniors running unsupervised. No handoffs that disappear into someone else's queue.