Sorin began his career in the private sector, working in the statutory audit and insurance industry in Paris. He then moved to the public sector and joined the European Commission in 2008, working in the Common Audit Service of the Directorate-General for Research and Innovation. During his time in the Commission, he held various positions, including ex-post auditor, team leader of Quality Control, and Head of Sector for Back Office and Audits. His responsibilities included ex post audit, internal control, finance and budget management.

In 2026, Sorin joined the European Personnel Selection Office (EPSO) as Deputy Head of Unit in the Corporate Services unit. In this role, he supports the Head of Unit in ensuring sound financial and IT management of EPSO, including coordinating audits, risk management, and internal control.