Network separation is an important policy that Cyber Incident prevent cyber and protect data. Recently, the IT environment is changing in software development, such as remote work, using the cloud, and using open sources. Due to these changes, fintech companies' development productivity and efficiency are lowering due to network separation regulations, and the demand for easing network separation continued. The government revised the regulations electronic financial supervision(hereafter EFS) in response to needs for mitigation of network separation in the IT environment and fintech companies. Some amendments to the EFS, which took effect on 01/01/2023, mitigate network separation only for research and development purposes in cloud environments. If software developed in a cloud development environment is applied to an operating system through a distribution system the existing perimeter-based security model will not satisfaction the network separation conditions. In this Study, we would like to propose a way to maintain the DevOps system in a network separation environment by Using the zero trust security system.