1994-2000 Demonstrator, Mathematics & Computer Science Department Faculty of science, Benha University, Benha, Egypt.

2000-2006 Assistance Lecturer, Mathematics & Computer Science Department Faculty of Science, Benha University, Benha, Egypt.

2002-2006 Young Researcher, Macedonia University, Applied Informatics Department, Thessaloniki, Greece.

2006-2007 Lecturer, Faculty of computer science &nformatics, Department of scientific computing, Benha University, Benha, Egypt.

2007-2011 Assist. Proof. , Computer Science Department, Qassim University, Qassim, Saudi Arabia.