I think you'd be wasting your time going after certification; rather, I think you should work with someone who knows the job market well, explain your interests to that person, then develop a plan of attack at the industries or companies you decide to target. Especially if you've done numerical or computational analysis, there are always oodles of opportunities in cryptography, encode/decode algorithm development, signal processing,...
and other intensely mathematical arms of the computing biz.
Good luck with your efforts, and don't sell yourself short.
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