Purpose: theoretical and analytical substantiation of the directions and mechanisms of digital tools and platform-based solutions impact on the transformation of economic policy and public governance systems in the BRICS countries (with a focus on Russia, India, and China).

Methods: research methodology is based on a systemic and institutional approach, involving the use of comparative and structuralfunctional analysis methods, content analysis of regulatory and statistical data, as well as elements of the platform economy theory and the concept of «state as a platform» to assess the impact of digital instruments on the formation of new economic policy in the BRICS countries.

Results: study's findings demonstrate that digital tools and platform solutions are becoming a systemic factor in the transformation of economic policy in the BRICS countries, creating the preconditions for sustainable economic growth and improved public administration efficiency. The development of a platform economy is found to facilitate the transition from traditional forms of government regulation to an ecosystem-based governance model based on network effects, reduced transaction costs, and the personalization of public services, thereby enhancing the transparency and adaptability of institutions. The concept of «state as a platform» is substantiated as an institutional basis for the formation of a new digital model of an interaction between the state, business, and society, aimed at increasing technological sovereignty and inclusiveness of socio-economic development.

Conclusions and Relevance: study examining the fundamentals of platform economy development using Russia, India, and China as examples confirmed that digital tools are a key driver in the formation of new economic policies in the BRICS countries. The transition from fragmented digitalization to a platform model is shaping a new architecture of economic relations based on the principles of openness, networking, and technological sovereignty. The need to adapt national strategies to the conditions of the digital economy and develop institutional mechanisms to ensure the sustainability and inclusiveness of digital transformations in the BRICS region is emphasized.