A Node.js SaaS App Field Guide to Lean KPI Telemetry and Hosted Dashboards

Building a scalable SaaS application requires a strategic architecture using React, Node.js, and AWS to manage increasing users, API traffic, and multi-tenancy. Key engineering focuses include security, performance, and maintainability. For telemetry, Node.js apps should utilize hosted metrics for aggregate trends and operational alerts, or detailed event stores for searchable customer actions. Choosing between direct hosted metrics APIs and collectors depends on infrastructure size, dimension control, and the need for centralized telemetry exits.