Go and bash. Occasional Python, C, C++, and Javascript. Python and bash are the most productive, but quickly become troublesome as program size grows, at which

Go and bash. Occasional Python, C, C++, and Javascript. Python and bash are the most productive, but quickly become troublesome as program size grows, at which point I switch to Go. C and C++ are necessary to interact with system, third-party libraries, and extreme performance on occasion. Javascript is just an unfortunate necessity for the web.