06.18-07.19: Scientist, Department of Informatics and Chemistry, University of Chemistry and Technology, Prague, Czech Republic, under Assoc. Prof. Dr. Daniel Svozil.

05.15-04.18: Senior Scientist, Institute for Pharmacy, Martin-Luther University, Halle-Wittenberg, Germany, under Prof. Dr. Wolfgang Sippl.

09.17-present: Lecturer (equivalent of Assistant Professor in the US system or "Junior Professor" with tenure track in the German system), Chemistry Department, University of Buea, Cameroon.

08.14- 09.17: Senior Instructor, Chemistry Department, University of Buea, Cameroon.

02.14-08.14: Instructor, Chemistry Department, University of Buea, Cameroon.

05.14-05.15: Scientific Manager, Chemical Bioactivity Information Centre, University of Buea, Cameroon.

11.12-04.14: Research Assistant, Chemical Bioactivity Information Centre, University of Buea, Cameroon.

06.10-02.14: Part-time Lecturer, Chemistry Department, University of Buea, Cameroon.

09.09-05.11: Part-time Lecturer, Institut Supérieur de Technologie et du Design Industriel (ISTDI, a private university), Douala, Cameroon.

06.08-08.09: Graduate Assistant, Chemistry Department, University of Douala, Cameroon.