Every managed data platform asks you to put your data, identities, and queries in the vendor's plane. This one doesn't. Data, identity, catalog, compute, and policy — all five in infrastructure you control, by construction.
The map of the platform: an assembly of open-source parts behind a Backend-for-Frontend that holds your token and enforces your identity at every hop. What each surface does, how a request flows, and where the cliffs are.
Sixty-three capabilities, three levels, no marketing. The Iceberg Matrix is what compatibility looks like when the rubric is public and the evidence has to land in code. Here is why it works, what we learned from sitting on it, and why every open standard needs one.