Answer: the mythical man-month effect
Step-by-step explanation:
The scenario given in the question above signifies the mythical man-month effect.
According to the mythical man-month effect, it explains that when more programmers are added to a particular project, this eventually led to a delay in the project.
Since we are told that Devon needs more coders to complete the project on time and therefore hired more people to complete the project but eventually led to a delay, thus signifies the mythical man-month effect.