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@remi I did a bit of Fortran coding at uni (physics major, not CS), then upon graduation went to silicon valley at an electronics startup in QA dept and did some non-trivial coding in an early spreadsheet (least-squares curve fitting and X-bar/R-chart for production stats tracking). After that, moved to Sacramento to work at a DoD missile contractor and wrote image processing code for an aerospace CT scanner (Fortran and C). Then wrote medical imaging software for an eye/retina imaging company (C/DOS). After that, C/Unix/SQL first at an ERP/MRP company followed by C/C++/Unix/Windows at two network management systems vendors. Finally, I foolishly started a Java enterprise sw company, and after that, just boring jobs mostly in C#. Now, I write code for my own projects. I didn't really learn much about CS until about 2005-2010 because it wasn't needed and I wasn't even aware of CS course topics like Algorithms:( Now, I've self taught myself enough CS for the projects I'm currently working on. Edit: about 8 years ago I took some MOOC ML courses and learned R, but this didn't lead to a job doing ML. My website has some example coding side projects under the Tech Examples and ML Intro Project sub-pages which show that I've taught myself some CS:)