Here’s a great exercise that I tell everyone to perform. Give your completed resume to a friend or family member that has not seen it before. The less they actually know about your professional background, the better. Tell them that you are going to give them a short amount of time to glance over your resume and then ask them to tell you what they remembered. But don’t tell them the amount of time you are going to give. Give them exactly 20 seconds to look at it. Then ask them what they saw or what they remembered. They better have noticed at least 3 of the key things you want to be noticed or else you have a formatting problem. This will most likely be company names that you worked for or job titles. And possibly/hopefully something from your Skills Summary section, if you included one.
Then give them 40 more seconds to see if they can pick up most of the remaining hot points. For a hiring manager looking through a stack of resumes, the first 20 seconds of reading will determine into which pile your resume goes (investigate further versus not a fit). I’m not exaggerating. A hiring manager with a stack of 30+ resumes has no choice but to spend about 20 seconds in their initial sorting exercise. The ones that end up in the good stack will get a further look (the additional 40 seconds) to decide if they are a “definite phone screening interview” or just a “maybe for a second round if the others don’t work out”.