This paper introduces a systematic approach for executing cross-validation on User Interface (UI) states and the respective JSON payloads on a cloud-based test automation platform. At Charter communications, this methodology was created to address discrepancies stemming from cache lag time, async rendering, and data transformation issues that quickly lead to the UI being out of sync with the canonical output from the API. The solution proposes to embed, within Selenium WebDriver based DOM Inspection and parallel RESTful API calls, synchronization checks. By incorporating the synchronization checks into a CI pipeline, infinite scalable cross-browser nightly regression testing is achieved. Ultimately, an efficient process which generates fast, validated defect findings is achieved.