Encik Moslim started his career as a civil engineer with Public Works Department (PWD) Malaysia in 1978. He served in various positions i.e. Road Engineer, Building Engineer, District Engineer, Assistant Director, Director of PWD PERDA Unit, Resident Engineer and also Design Engineer.
In 1996, Encik Moslim joined private sector construction based BumiHiway Group of Companies (now known as Selia Group) as Chief Operating Officer ("COO") for the construction arm. He then served as the COO of its associate company namely Infra Desa Johor Sdn Bhd which was involved in construction of rural roads in the state of Johor.
Encik Moslim formed a project management consultancy firm namely Haluan Fokus Sdn Bhd in 2001 and undertook several project audit and project management works for the Ministry of Finance, Construction Industry Development Board and Majlis Amanah Rakyat MARA, Malaysia.
Encik Moslim also runs a sole proprietor civil and structural consulting firm namely Sejagat Consultant that undertook the design of building projects and the asset management and maintenance of rural roads.