Proceedings of the International scientific and practical conference ―The Hague Conference on Science and Public Policy‖ (May 8-10, 2026) / Publisher website: www.naukainfo.com. – The Hague, Netherlands, 2026. - 232 p.

29 COMPUTER AND SOFTWARE ENGINEERING UDC 004.415.5:004.413.2 Kutaiev Serhii Valentynovych Senior Lecturer Lviv State University of Internal Affairs, Lviv, Ukraine CROSS-PLATFORM E2E AUTOMATION STRATEGIES FOR UNIFIED API AND DESKTOP INTERFACE VERIFICATION Abstract: The complexity of modern enterprise software requires the implementation of multi-stage testing workflows that span across different technology stacks, including RESTful services and native desktop clients. This paper explores the methodology of implementing E2E (End-to-End) automation strategies within such heterogeneous environments. The core focus is placed on creating a unified testing framework that can transition seamlessly from backend data initialization via API to frontend functional verification in desktop applications. By establishing a continuous verification chain, the proposed approach ensures that business logic remains consistent across all architectural layers. The study details the technical challenges of maintaining state synchronization between disparate components and provides strategies for building resilient, cross-platform automated scenarios that simulate real-world user journeys. Keywords: E2E automation, heterogeneous environments, API testing, desktop UI, system integration, cross-platform verification.