For about 15 years, I was a Materials Scientist with GE/MartinMarietta/LockheedMartin, working on DoE and NASA space projects (SP-100/Cassini). Then I developed optimization models and software for process industries to help them minimize waste and right size their inventories. Lately, I've been working on in-house software for an education company to manage their operations and inventory.
I've used almost all the popular software languages at one time or another, but I currently code mostly in Python.