The rapid shift toward Software-Defined Vehicles (SDVs) is driving an unprecedented rise in the complexity of automotive software. At the same time, compliance with functional safety standards such as ISO 26262 and cybersecurity standards such as ISO/SAE 21434 has become non-negotiable. These pressures expose significant gaps in the current verification and validation (V&V) practices. Today, many organizations rely on costly proprietary cloud ecosystems or heavily instrumented on-premises Hardware-in-the-Loop (HIL) labs. While effective in certain contexts, these methods are capital-intensive, difficult to scale, and often lead to fragmented compliance workflows. Most critically, they fall short of delivering a unified, traceable process that aligns seamlessly with Automotive SPICE requirements, particularly SWE.4 (Software Unit Verification), SWE.5 (Software Integration Testing), and SWE.6 (Software Qualification Testing). This paper proposes a cloud-native Testing-as-a-Service (TaaS) framework that enables safety-compliant, automated verification across the software lifecycle without the need for hardware ownership or vendor lock-in. The framework orchestrates virtual ECUs and sensor models on public cloud infrastructure with elastic scalability, while also integrating client-owned HIL systems through deterministic low-latency private links. A compliance layer ensures end-to-end traceability, automatically producing audit-ready reports that map requirements directly to test execution results in line with Automotive SPICE and ISO 26262. Pilot deployments with Tier-1 automotive suppliers demonstrate up to 40 percent faster test cycles and improved utilization of engineering resources. By embedding compliance principles and modular, vendor-agnostic design, this approach represents a paradigm shift for automotive V&V, enabling organizations to balance development agility with the rigor of functional safety in the SDV era.