Check out these examples of organizations, corporations, and research institutions that hire mathematicians and computational scientists:
Association for Women in Mathematics
Australian Mathematical Society
Canadian Applied and Industrial Mathematics Society
Canadian Mathematical Society
Chinese Mathematical Society
Edinburgh Mathematical Society
European Consortium for Mathematics in Industry
European Society for Mathematical and Theoretical Biology
Gesellschaft für Angewandte Mathematik und Mechanik
Indian Society of Industrial and Applied Mathematics
Institute of Mathematics and its Applications
Israel Mathematical Union
Japan Society for Industrial and Applied Mathematics
London Mathematical Society
Mathematical Association of America
Mathematical Optimization Society
Society for Industrial and Applied Mathematics
The Royal Dutch Mathematical Society
Sociedad Española de Matemática Aplicada
Società Italiana di Matematica Applicata e Industriale
Sociedade Brasileira de Matemática Aplicada e Computacional
Société de Mathématiques Appliquées et Industrielles
Societatea Română de Matematică Aplicată şi Industrială
Swiss Mathematical Society
The European Mathematical Society
The International Society for Optical Engineering
Vietnam Society for Application of Mathematics