They program right down to the bare metal. Applications programs are for dullards who can't do systems programming. Don't comment their code. If it was hard to write, it should be hard to understand and even harder to modify. Don't draw flowcharts.
Flowcharts are, after all, the illiterate's form of documentation.
They get excited over finite state analysis and nuclear reactor simulations. Don't use APL unless the whole program can be written on one line. Only effeminate programmers use more parentheses than actual code. Strong typing is a crutch for people with weak memories. Never work 9 to 5.