In 2021, Al Yammahi led the establishment of Hayat Biotech, the development of the Hayat Biotech Life Sciences Park in Abu Dhabi and a manufacturing plant in Serbia. In March 2024, the company formed a partnership with the Kenya BioVax Institute to advance vaccine research and development in Kenya. Al Yammahi was part of the team that oversaw the launch of the 4Humanity campaign. He also oversaw the rollout of Hayat Vax, the first Covid-19 vaccine produced in the Arab world. He was previously the acting executive director and director of projects and strategic studies at the U.A.E. Office of the Minister of State.