METHODOLOGY FOR DEVELOPING CLOUD SERVICES IN A CLOUD HIERARCHY

The paradigm of cloud computing and its associated technology is gaining momentum among IT companies because they allow you to use expensive technology at a low cost. Nowadays, cloud applications are developed in Platforms as a Service following the PaaS architecture imposed by several providers. We find in the literature some works describing frameworks and architectures for cloud software development, but there is a lack of a generic methodology which covers the whole application development lifecycle. Many software developers trying to get the benefits of cloud computing and want to access the cloud environments at low cost and easy access. Many issues are encountering in development and deployment of these platforms regarding programming models, application architecture, APIs and services it provided. The processes of development and using cloud services have their own economic component, they are characterized by labor costs and funds on the one hand, and the receipt of direct or indirect income - on the other. The complexity of modern clouds determines the need to apply methods of economic and mathematical modeling. The purpose of the article is to develop theoretical and methodological approaches and create a basis for a new model of software development for cloud services that can meet the requirements of users regarding the quality and cost of services, and takes into account the multi-level structure of cloud environments. The essence of this approach is to systematize the data on the functional suitability of the various structural elements of cloud services, to determine the sets of possible platforms and elements, and in their comparative analysis in terms of the three-tier hierarchy of the cloud for the evaluation of cloud service development projects.