Have shipped cloud infrastructure as a product. You’ve owned at least one of compute, networking, storage, or multi-region and multi-tenant systems at a cloud, infrastructure or PaaS company, as the owner rather than a neighbouring team. You can judge the tradeoffs: instance sizing and capacity, disk and storage economics, scale-to-zero versus always-on, single-tenant versus shared, and the distance between “works in one region” and “works in twenty.” Familiarity with how enterprises buy infrastructure (PrivateLink, BYOC, procurement) is a bonus.