Tenant isolation strategy — shared schema, schema-per-tenant, or database-per-tenant — is the decision we see founders get wrong most often under time pressure.
Shared schema with row-level security scales cheaply for most B2B SaaS, but enterprise customers will eventually demand stronger isolation guarantees.
We design for a migration path from day one, even if we start with the cheapest option, so scaling up isolation later doesn't mean a rewrite.