The serverless trend emerged from the introduction of FaaS from providers like AWS Lambda. Moving compute from instances and containers to on-demand FaaS has massive appeal. But functions are one small part of the serverless story! I present a way of building serverless applications to minimise code and maximise use of managed services. This approach shifts the emphasis from coding to the development of powerful, scalable architectures. I show ways of replacing many of your Lambdas with alternative managed services and explain why code should first and foremost be a tool for building on-demand infrastructure.
I will cover five common uses for serverless functions today; orchestration, delegation, data reshaping, database storage or querying and service integration.
In each case, I will demonstrate how system complexity, cost and maintenance effort can be reduced by adopting client-side orchestration, an event bus, managed data stores and cloud-native data transformation solutions such as AWS Glue, S3 Select, Kinesis, Sagemaker and API Gateway.
Eoin is Co-Founder and CTO of fourTheorem, a modern application development consultancy based in Ireland and New York.
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