Industrial Automatic Control Systems and Controllers Annotation << Back Hybrid Cloud Solutions for Processing High-Load Financial Systems Grafov M.D. The article explores approaches to designing and operating hybrid cloud architectures for processing high-load transactions in fi nancial systems. To evaluate the efficiency of the hybrid model and the conditions for its secure operation, a simulation study was conducted using the adapted NetworkCloudSim-DDoS environment, enabling the analysis of performance, resilience, and cybersecurity under variable workloads and simulated targeted attacks. The fi ndings show that combining public and private segments provides a balance between scalability, fault tolerance, and control over sensitive data. The effectiveness of implemented security mechanisms, including microsegmentation, TLS 1.3, SIEM, and WAF, has been confi rmed. Recommendations for secure integration of hybrid solutions are formulated, including the adoption of the Zero Trust concept, automation of incident response, and application of DevSecOps practices. The results demonstrate the applicability of the hybrid model for building high-performance and cyber-resilient fi nancial infrastructures. Keywords: hybrid cloud architectures, financial systems, high-load transactions, cyber resilience, DevSecOps, Zero Trust, simulation modeling, data security. DOI: 10.25791/asu.11.2025.1623 Pp. 24-32.