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Platform architecture

The Union architecture consists of two virtual private clouds, referred to as planes—the control plane and the data plane.

Control plane

The control plane:

  • Runs within the Union AWS account.
  • Provides the user interface through which users can access authentication, authorization, observation, and management functions.
  • Is responsible for placing executions onto execution plane clusters and performing other cluster control and management functions.

Data plane

All your workflow and task executions are performed in the data plane, which runs within your AWS or GCP account. The data plane's clusters are provisioned and managed by the control plane through a resident Union operator with minimal required permissions. Your secrets and datasets reside in the data plane. Union infrastructure does not have direct access to them.

Union operates one control plane for each supported region, which supports all data planes within that region. You can choose the region in which to locate your data plane. Currently, Union supports the us-west, us-east, eu-west, and eu-central regions, and more are being added.

Data plane nodes

Once the data plane is deployed in your AWS or GCP account, there are different kinds of nodes with different responsibilities running in your cluster. In Union, we distinguish between default nodes and worker nodes.

Default nodes

Default nodes guarantee the basic operation of the data plane and are always running. Example services that run on these nodes include autoscaling (worker nodes), monitoring services, union operator, and many more.

Worker nodes

Worker nodes are responsible for executing your workloads. You have full control over the configuration of your worker nodes.

When worker nodes are not in use, they automatically scale down to the configured minimum. (The default is zero.)


The Union hybrid architecture lets you maintain ultimate ownership and control of your data and compute infrastructure while enabling Union to handle the details of managing that infrastructure.

Management of the data plane is mediated by a dedicated operator (the Union operator) resident on that plane. This operator is designed to perform its functions with only the very minimum set of required permissions. It allows the control plane to spin up and down clusters and provides Union's support engineers with access to system-level logs and the ability to apply changes as per customer requests. It does not provide direct access to secrets or data.

In addition, communication is always initiated by the Union operator in the data plane toward the Union control plane, not the other way around. This further enhances the security of your data plane.

Union is SOC-2 Type 2 certified. A copy of the audit report is available upon request.