Owns the stack merchants actually run: Go services, Postgres, migrations, and hosts that do not surprise anyone at lunch.
Sarah built the first node processes and the rule that schema changes go through numbered SQL, not a GUI. She cares about tenant isolation, unix sockets, and a deploy path a tired engineer can follow without folklore.
As CTO she splits platform (www, api, deploy) from node (many shops on one machine). She reviews APIs the panel and storefront share, and she will block a feature that cannot be rolled back. Incidents get a fix-forward migration, not a rewritten history.
She previously led backend at a payments company. She still writes the migration comments she wants to read at 2 a.m.