Scaling readiness begins with clear product boundaries and observable behavior. It does not begin with turning every module into a separate service.
Model tenants and ownership explicitly
Define what a tenant represents, which data belongs to it, whether users can belong to several tenants, and how operator access works. Retrofitting ownership rules after data grows is risky.
- Tenant and account lifecycle
- User membership and invitations
- Roles, permissions, and administrative access
- Data isolation and deletion behavior
Separate plans from permissions
Permissions answer what a user may do. Entitlements answer what a customer has purchased. Keeping them distinct prevents billing changes from becoming authorization bugs.
Design for operation
Support tooling, audit context, request tracing, background-job visibility, and safe account repair are part of the product system. They determine how quickly the team can understand real incidents.
Scale from evidence
Measure slow queries, queue delay, resource saturation, and user-facing latency before choosing a scaling intervention. Clear module boundaries make it possible to extract a service later if workload or ownership justifies it.