Ok, im viewing your site from an 11 inch macbook air. Things to consider: the email input should be above the fold. I should see it as soon as I land on your page. Instead of saying "Enter Your E-Mail to Request an Invite" you could put "Claim Our Early Adopter Badge", something of the sort. The logo is too big and should be higher, in order for everything else to fit. I would rearrange the copy of the main message, making it say Hire a Neighbor before the other part. That text could be smaller and with a cooler font. The image of the map on the phone should be clear and have the proper dimensions of an iphone app.
All of that said, your landing page should not be your MVP. You'd do well to make a mobile site that looks and feels exactly like your app would feel. Then the demo for the startup weekend could be a video showing you navigating through the mobile site.