Product Architecture, People Architecture, and Scaling an Organization?

When an organization grows, the first thing you think about his people. Who should be reporting to who? So then typically for a start up that grows faster as any start they start with the system based organizations. And when they scale multiple product lines, hit those systems, it's probably not able to scale and grow faster. That's when i saylx speed kills or grow slowly down. How do you scale an engineering tem that ar 20 people operate on thousand lines?"