This article introduces a novel DevOps methodology for serverless software delivery and evolution, developed and tested on three large-scale industrial case studies in the scope of the European Union (EU) Horizon-2020 Framework Programme within a Research and Innovation Action (RIA) called RADON. RADON aimed at developing a DevOps framework to create and manage microservice applications that can exploit serverless computing. This article fleshes out the methodology by which RADON-based applications can be developed. Concretely, RADON intends applications as sets of independently deployable microservices that also use Function-as-a-Service (FaaS) and container technologies in the mix. Evaluating the proposed methodology, we observed that the framework offers a valuable ground to address the complexities involved in serverless application development and operations. Specifically, the framework harmonizes the abstraction and actuation of action-trigger rules avoiding FaaS lock-in while optimizing decomposition and reuse through model-based FaaS-enabled development and orchestration.
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