According the the footer in my receipt email the last electrician I used used Housecall Pro (https://www.housecallpro.com/) as their back office. It worked really well, I got SMS reminders about when they were on the way and even texted them a video explaining what I needed done so got an accurate estimate before anyone showed up. Now that I think about it I have no idea if the dispatcher I texted with was an employee of the electrician or this company, but I guess I don’t care.