Architecture

The Notifications solution in Altinn is made up of multiple ASP.NET Web API applications deployed as Docker containers to a Kubernetes cluster.

System architecture illustration

The solution is supported by multiple cron jobs running in the same Kubernetes cluster, a Kafka server and an instance of Azure Communication services.

The following diagram illustrates the overall data flow.

Process flow between microservices and Kafka topics

Vis/skjul innhold Flow chart for order processing

Vis/skjul innhold Flow chart for email notification processing

Vis/skjul innhold Flow chart for SMS notification processing

System and service dependencies

Internal

• Altinn Authorization: used to filter recipients being sent to an organization.
• Altinn Profile: used to retrieve recipient information.
• Altinn Register: used to retrieve recipient information.

External

• Azure Kubernetes Services: hosts the docker containers for microservices and cron jobs in a fully managed Kubernetes cluster.
• Kafka on Confluent cloud: hosts the kafka cluster the microservices consumes and produces messages to.
• PostgreSQL: used for storage.
• Azure Communication Services: used to send emails.
• Azure Event Grid: used to subscribe to status updates for sent emails.
• LINK Mobility used to send SMS.
• Maskinporten used to generate tokens for external REST API requests.