Siddiqui joined the Arabian Healthcare Group in 2006. In 2023, Dignity Health International, the international arm of CommonSpirit Health, acquired a minority equity stake in RAK Hospital, the flagship multispecialty hospital of AHG, The hospital is undergoing an expansion plan to reach 200 beds by the end of 2024. Siddiqui also sits on the board of the RAK Chamber of Commerce and Industry, the advisory board of the CEO Club International in Dubai, and a founding board member of the UN Office for Disaster Risk Reduction.