If the world of STEM is looking for more women role models, Véna Arielle Ahouansou and Alejandra Estanislao are candidates.

Both are young and have degrees in a field involving science, technology, engineering or mathematics — the disciplines where women are significantly underrepresented.

Dr. Ahouansou, 25, has a medical degree from her native Benin, a small West African country. Two years ago she parlayed that into a start up, Kea Medicals, that has created electronic patient record management software that is now available in five African countries.

Ms. Estanislao, 31, originally from Venezuela, also wanted to be a doctor but got a degree in mathematics and finance at a top French engineering school, and she is now a software engineer at Google in Paris.

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