Adaptation and integration of large scaleapplications to devops environment

In this study, old school software development models that have been used for a long time period and still being used by organizations are defined. After these definitions, necessary changes and DevOps integrations that have occurred over time for these models and experiences of organizations which made a transition from old Project development models to DevOps are explained with practical examples by considering the causes and consequences. The software development discipline model, which we can call the oldest in the literature is called as Waterfall Model. According to the needs that emerged later, this model has been renamed as V-Shaped model, Spiral Model, Additive Model and Agile Model chronologically. Today, the most efficient model is considered as the Agile model when compared in terms of usage and responding to needs. The reason for this is that it can keep the discipline flexible according to the customer and business model. In other words, as a project management discipline, Agile Model can meet the needs of today's software development applications. Despite these features, Agile model is not preferred by various organizations. The main reason for this is the transformation difficulties experienced in the old built systems of the organizations that avoid this preference. The project disciplines that institutions with these old-fashioned systems are pursuing to imporve the practices and applicatiaons they serve today do not have the necessary flexibility in this sense. In addition, the institutional discipline owned by organizations also does not have a clear understanding of working towards a new and more flexible model. Besides these factors that prevent development, there are different reasons that prevent the development of these institutions. Findings obtained in the research reveal these elements at institutional level. The findings also reinforced and consequently applied to an organization that has already an active business cycle.