Today is Ada Lovelace Day. To celebrate four female engineers from around the world are sharing their experiences of working in male-dominated professions. Now in its sixth year, the annual celebration of women working in the fields of science and technology is named after the woman now regarded as the world’s first computer programmer. Ada Lovelace worked with the inventor Charles Babbage on his “analytical engine” creation in the 1850s – a mechanical computing device that he designed but never built. This year is also the 200th anniversary of the birth of Ada Lovelace, daughter of mathematician Annabella Milbanke and the poet Lord Byron.