We are living through a hardware renaissance, with more capital flowing into humanoid robots, surgical robotics, and electric aircraft than in decades. Each rests on thousands of engineering decisions, yet the workflow around them is fractured across three core layers. Design collaboration is scattered across emails, spreadsheets, and slide decks. Version control history is contradictory, leaving teams guessing which file is current. Most critically, engineering reasoning, the vital thinking behind a change, is rarely written down. When an engineer leaves, that context walks out with them, and the team repeats old failures. The last layer matters most: the true asset is not the physical part, but the reasoning behind its shape. Software solved this long ago; hardware did not. Kyumi is the system of context for engineering decisions and their outcomes. Every review and revision adds to a compounding knowledge base owned by the company, growing more valuable the longer it is used. Kyumi replaces these fractured layers with a single, unified workspace for version control and design review. We give teams one definitive version tree and a traceable record that captures not just what changed on a part, but the vital reasoning behind it. We are on the frontier of a modern reindustrialization. Kyumi’s mission is to equip the teams building our physical future with the tools they need to ship at software speeds.