Online banking services have though financial world from top to bottom, consequently, online banking systems are a significant feature of today's financial architectures. This comprehensive review examines the development and implementation of an advanced Online Banking System that integrates cutting-edge technologies: React for the frontend, popular hypertext preprocessor laravel for the back end, and MySQL for the Database. In the considerations, several areas of system characteristics are explained in detail: protection features, structure of the interface, technological support, and system structure. Special focus is made on crucial security mechanisms including one-time password, superior methods of detecting fraud, sophisticated biometric identification and management interfaces. The review also comprehensively assesses how the system responds to issues in digital banking, such as security vulnerabilities, access needs of the user, and the legal requirements, as well as the need for expansion. It also talks on the eventualities of the leading banking operations, including the processing of real-time banking transactions, automatic bill payments, and tracking of investment portfolios. Particularly in the case of banking architecture, small concern is paid to its compatibility with the current banking infrastructure, the degree of security, and the improvement of the system's interface. Another equity euro includes assessment of a disaster recovery, data backup and compliance with international bank regulation in the system. In this way, the review shows that modern technological solutions can seamlessly combine concepts from both traditional banking and new innovative solutions and become the new standard for financial technology in terms of security, effectiveness, and usability.