Modernizing CI/CD Pipelines: Migrating from Legacy Tools to GitLab for Enterprise Applications

In today’s modern software development, CI and CD pipelines are essential tools for faster and more reliable delivery of high-quality software. Such legacy CI/CD tools perpetuate themselves, and many enterprises continue to cling to inefficient, janky, and constantly fragmented tools that default to introduce complexities in scaling and integrating with modern technologies. This paper advocates developing a modern CI/CD system with GitLab, a DevOps platform combining version control, CI/CD, monitoring, and security into a single unified platform. This paper studies the difficulties with the current CI/CD systems, what GitLab presents advantages for, and how to perform an enterprise migration of CI/CD. Scalability, automation features, and smooth integration with cloud platforms like Kubernetes and AWS are advantages of Google GitLab. A real-world case study of migration to GitLab shows empirically that it increased the deployment frequency, lead time, and operational efficiency. The results indicate that GitLab provides a good scale, efficient, and integrated solution in support of the requirements of the modern software architecture, which includes microservices and cloud-native applications. This research gives businesses a hands-on approach to their CI/CD pipelines, focusing on automated processes, toolchain convergence, and continuous improvement. Organizations adopting GitLab acquire speed in software delivery, lessen operational costs, and keep the market edge when technology becomes more complex.