This article explores the paradigm shift in platform engineering security brought about by Zero Trust Architecture (ZTA) in cloud computing environments. As organizations increasingly adopt cloud-native architectures and microservices, traditional perimeter-based security models prove inadequate for protecting complex, distributed systems. The article examines the core principles of ZTA, including robust identity and access management, least privilege access, micro-segmentation, continuous monitoring, and secure communication. It delves into the implementation strategies of ZTA in platform engineering, highlighting its benefits such as enhanced security, improved compliance, increased resilience against threats, adaptability to dynamic environments, and improved visibility. The article also addresses the challenges of implementing ZTA, including complexity, potential performance concerns, user experience considerations, cost implications, and the risk of vendor lock-in. Through an analysis of industry trends, adoption rates, and quantified benefits, the article demonstrates how ZTA addresses critical security challenges in modern cloud environments, ultimately enabling organizations to create more resilient, compliant, and adaptable platforms in the face of evolving cyber threats.