The law of the triple constraint is a familiar adage that suggests only 2 of 3 factors (Time, Quality, and Money) can be satisfied -- you can't have all three.
The hidden costs of not focusing on the quality of your expertise shows up in the quality of your code. The bottom line is impacted when operational and support costs spiral upwards as uptime and end-user satisfaction dwindles.
At Kitestring, our approach is to always aim for quality when assessing our future employees. We do this using an online assessment, video interviews with multiple engineers, and a final good-fit introduction with our clients. By assessing and choosing the right quality developers and project people, we've seen over the past few decades that project timelines are met more often, saving a large part of the uncalculated overspend of late projects.