(Australian here) I built http://www.trackmyride.com.au from scratch by myself. The system took about 10 months to build working on it daily after I saved up the initial capital. It has been tough work but recently with a change of marketing we've been gaining some good traction in both the private and business industries now. All our customers love the software itself so that's a big positive but I think I need to redesign the landing page again. I'll do that after the project below is completed.

Since June 2012 I've been working on a new project, solo again putting in a few hours here and there as I can which should be ready to launch hopefully in another week. That project is still in stealth mode until it's unveiled though. I was hoping it could have been completed much quicker but you know how these things turn out. Though the TMR business' hardware and software can work anywhere in the world the marketing for it has been aimed at Australians so hence all our customers are aussies. The new project will be aimed primarily at Americans so that should be an interesting learning curve.

As for bottlenecks, by far the biggest hurdle with Track My Ride has been the marketing. As a programmer by trade when I first started out I had no idea how to market the system and mostly it's been a case of throw a lot of $ and see what sticks. Having a co-founder with marketing know how would have helped a lot. That being said though revenues and sales are still increasing each month so as a solo venture it's turned out pretty well so far.