#Serverless.
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AWS Lambda
AWS Lambda runs code in response to API calls or events without a team provisioning or patching servers. Common triggers include API Gateway, S3, SQS and EventBridge. Each Lambda Function invocation runs independently: horizontal scaling is managed, but shared state must never be assumed.
Azure Functions
Azure Functions is Microsoft's serverless compute offering for code started by HTTP, timers, files, database changes, queues or event streams. Its important convenience is bindings: they connect triggers and Azure services without hand-writing every integration. The difficult work still lives in failure paths, data contracts and operations.
Google Cloud Firestore
A document-oriented NoSQL database for web, mobile, and server apps with realtime listeners, offline support, and clear boundaries around queries and cost control.
Google Cloud Functions
Serverless functions for HTTP and event-driven backends, with deliberate choices required for builds, IAM, events, and the underlying Cloud Run operation.
OpenFaaS
OpenFaaS is a developer tools tool whose value should be judged in a concrete workflow with clear ownership and review.