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How do serverless systems support hybrid workflows?

Serverless systems support hybrid workflows by acting as a flexible bridge between cloud and on-premises resources. They enable event-driven integration, allowing on-premises systems to trigger cloud-based functions without requiring direct infrastructure management. For example, an on-premises application can publish events to a message queue like Kafka or RabbitMQ, which then invokes a serverless function (e.g., AWS Lambda) to process data in the cloud. This decouples on-prem workloads from cloud scaling logic, letting teams modernize specific components without overhauling entire systems.

A key advantage is seamless integration with existing infrastructure. Serverless platforms support APIs, databases, and networking tools that connect to on-premises environments. Azure Functions, for instance, can use Hybrid Connections to securely access on-premises databases or APIs over VPNs. Similarly, AWS Lambda can interact with on-prem systems via Direct Connect or API Gateway. This allows workflows like processing user uploads in cloud storage (e.g., S3) while validating data against an on-prem legacy database. The serverless layer handles transient tasks, reducing the load on fixed-capacity on-prem servers.

Serverless also simplifies scaling hybrid workflows. For example, an on-prem application might generate bursts of data during peak hours. A serverless function can ingest this data, process it in the cloud, and sync results back to on-prem systems using tools like AWS Storage Gateway. This avoids overloading on-prem resources while leveraging cloud elasticity. Additionally, serverless orchestration services (e.g., AWS Step Functions) can coordinate multi-step workflows across cloud and on-prem services, ensuring tasks like batch processing or report generation use the right environment for each step.

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