The accelerating adoption of multi-cloud strategies has transformed the contemporary enterprise computing landscape into an ecosystem of heterogeneous platforms, vendors, governance regimes, and delivery pipelines. In this environment, Infrastructure as Code has emerged not merely as a technical mechanism for automating infrastructure provisioning but as a foundational epistemology for how organizations conceptualize, control, and evolve digital infrastructure. At the same time, platform engineering has matured from a set of DevOps tooling practices into a socio-technical operating model that structures how developers, operators, and business stakeholders interact with cloud capabilities. While these two paradigms have frequently been examined in isolation, the deeper interdependencies between them remain under-theorized, particularly in the context of enterprise-scale multi-cloud governance, developer experience, and organizational resilience. Drawing on recent advances in platform engineering, service automation, DevEx research, and multi-cloud governance literature, this article develops a comprehensive analytical framework for understanding how Infrastructure as Code and platform engineering jointly shape enterprise cloud architectures. Grounded in the best-practice model for multi-cloud IaC articulated by Dasari, this research positions IaC not only as a deployment mechanism but as an institutional control system that encodes architectural intent, compliance logic, and operational memory across distributed cloud environments (Dasari, 2025). Through a qualitative meta-analysis of contemporary industry and academic literature, the study synthesizes insights from DevOps culture, microservice architectures, digital engineering, and service automation to demonstrate how platform engineering operationalizes IaC into scalable organizational capabilities. The findings reveal that enterprises that integrate IaC into platform-centric delivery models achieve not only higher deployment reliability and security consistency but also superior developer productivity and strategic agility. The article further argues that the convergence of IaC and platform engineering constitutes a new form of infrastructural governance in which software code replaces policy documents as the primary medium of organizational control. By theorizing this convergence, the study contributes a novel conceptual lens for analyzing the future of enterprise cloud computing and offers a foundation for subsequent empirical investigation into how digital infrastructure is governed in the age of autonomous platforms and AI-augmented operations.