"Engineers" who use so many nested if's that I have to horizontally scroll my 2560px width monitor. They've lasted because they've usually only had one or two

"Engineers" who use so many nested if's that I have to horizontally scroll my 2560px width monitor. They've lasted because they've usually only had one or two employers, as a permanent employee (rather than a contract) and no-one code reviews until it's too late.