I feel like truss factories could use some help with quality control with machine vision probably. A problem is trusses are built by alcoholic meth heads making minimum wage rather than carpenters on site to save time and money, but then the truss factory has to send out an engineer to fix it on site, usually missing or wrong gang nails or its just out of alignment.
Temp laborers could probably use some software to help with tracking hours etc. Typically all the hours are tracked with just the supervisor writing down on a carbon copy how long they worked and gives it to the laborers to take back to their office which is then manually input to the billing system to pay the laborers at the end of the day.
Keep in mind there's a much larger population of non-smartphone users that only use flipphones in construction especially day labor so any sort of app meant for the workers or laborers to use would just go unused.