As you want to get the details of career after M.Sc Mathematics other than the jobs in teaching field so here is the information of the same for you:

M.Sc. Mathematics Job Types

Quantitative Risk Analyst
Equity Quantitative Analyst
Director Statistical Programming
Interest Rate Trading Strategist
Director Statistical Programming
Quantitative Developer
Managing Editor - Computer Science and Mathematics
Mathematical Analyst
Assistant / Associate Manager - Mathematics
Mathematics Specialist
Assessment Developer - Mathematics
Mathematics Subject Matter Expert

Some job types: -

Lab Supervisor
Researcher
Technician
Scientists
Consulting Physicist
Senior Physicist
Analytical Chemist
Lab Chemist
Production Chemist
Chemical Engineering Associate
Biomedical Chemist
Demographer
Statistician
Accountant
Technical Writer
Loan Officer
Treasury Management Specialist