I use C++/C for software development targeting embedded systems that run on embedded Linux or RTOS (various). Python is my second language for tooling and scripts. I have also worked with golang, javascript, C#, ruby, PHP, perl, lua and assembly. I did web applications for a few years as well - both front-end and back-end. I can handle mostly anything in the full stack, from coding / scripting in the userspace, to drivers close to the hardware.