The full answer
Node.js handles many simultaneous connections efficiently, which suits APIs, real-time features such as chat and live updates, and integration-heavy products that spend most of their time waiting on other systems.
NestJS adds the structure that plain Node.js projects often lack. Modules, controllers, services and guards have defined roles, so a payroll system or a marketplace API stays organised as it grows from a few endpoints to hundreds.
A typical Creuto backend exposes REST or GraphQL APIs, validates every request against typed schemas, authenticates users with tokens or your identity provider, enforces role-based access control and writes audit logs for sensitive actions.
Background work such as email, report generation and file processing runs through queues backed by Redis, and the service is containerised with Docker so it deploys the same way on AWS, Azure or Google Cloud, whether on Kubernetes or a managed container platform.
Using TypeScript end to end means the web app, the mobile app and the API can share types and validation rules, which reduces integration bugs. Where a workload is better served by Python, Java or .NET, Creuto builds that service in the right language and connects it over well-defined APIs.