He also has experience in the public sector having worked with the National Health Insurance Authority now NHIS. On the international front, he was enrolled in an internship program with the United Nations Office at Vienna (UNOV) DA office; an internship for the National Peace Council in Sunyani, Brong Ahafo Region. He also worked as a teaching assistant for Alternative Dispute Resolution (ADR) at the Catholic University College of Ghana. Osei is a member of Young International Arbitration Group (YIAG)–UK and Ghana Association of Certified Mediators (GHACMA).
He watches football in his spare time.