Which one CDN do you have set up, and was it easy to do? Suggestions?

It depends a lot of in the skill sets and experience of both people but in most cases the ux designer should be controlling the developer pretty heavily in order to make sure his ideas come through properly. The UX designer may just need to work on his approach so people don't feel bossed around and more like they are working together. In an ideal world, there would be a project manager who makes sure everything is communicated well and keeps the dynamic feeling great.

Create an ideal customer profile. Create some questions that will allow to you survey a potential tester to determine if they fit your profile. Design simple landing page with very clear value proposition that speaks to your ideal customer. Ask for a minimum of information up-front (email), but ask for more info after they commit by submitting the first piece of info. (KISSmetrics does a good job of this on their current website trial signup). Use the their answers to these profiling questions to put the applicants into buckets. Let in the most ideal bucket first, or split them into groups if they're big enough. Try and measure engagement the best you can. Measure qualitative and quantitative data. Schedule calls with your beta testers to find out more, especially with the ones who's user behavior seemed to indicate that they didn't get value from your product. Find out why. Make sure they are indeed your ideal customer. Pick up the phone and get to know your customers inside and out. Meet them in person if possible. Incorporate their feedback quickly and get more feedback. Rinse repeat.

Your skills would be most useful if you were starting your own startup and needed to make an early prototype to show to investors or potential cofounder developers. Your experience in debugging, testing, and agile, could help you get a job as a product manager, and the fact that you have a background in some sort of 'coding' will help too. It's very unlikely that it would help you get an actual dev job though, since you wouldn't be able to translate your programs into actual code that could be taken over/continued by other devs. Even if the programs you mentioned do allow you to export as code, it's unlikely that it would be exported in a way that's very usable by other devs.

You should try to engage people using social networks, it is easier to spread than email. The conversion rate on emails are low but is still a valid tool for that. Send and email with a simple and objective message that will make people want to try. The best way to have feedback from users is to watch them use the app. You should put them on the hands of everybody that you can and without any instrucions and just watch, don´t even say that the app is yours. Try to do it a lot. If you want feedback from others, you can include the feedback form inside the app and suggest users to answer occasionally. I would also strongly recommend to use a tool as Flurry Analytics. Is the best way to get data from how is the use of the application. Pay attention to those data and be open to change your app a lot, you may need more features or cut some off to make it easier to use. If you need more help please contact me.

Being a freelance developer for the last 10 years or so, I have seen and used almost every project management software you can think of, open-source and closed, and I have found that the "best bug tracking tool" completely depends on your process. I employ and direct teams in an Agile process that involves loose story-based requirements with point-based estimates, two-week cycles of iterative development, planning and retrospective sessions, and look-ahead and show-and-tell meetings with the stakeholders. It's important to me, then, that my tools have a method of capturing all those pieces with as much detail as I need but no more. On projects, I've successfully used Pivotal Tracker, Unfuddle, Redmine, Codebase HQ, Basecamp, Trello, and many others. I usually recommend people to Trello for light, agile management; it's essentially a digitized version of sticky notes and swim lanes. If your team actually needs a full-featured ticketing system, see Redmine (Rails), Trac (Python), or Mantis (PHP), depending on your language preference. Hosting a version of these yourself is fairly trivial, and numerous options exist for cheap or free hosted versions. For something in the middle, Github Issues is a good fit and the open-source clone GitLab.org replicates most of those features nicely. However, if you're looking for a hosted version, you're probably looking to offload that tricky "backup" thingy, and in that case, how important is your data? How proprietary? What's your business model? If you're working on an open-source project, Github will give your team a free account with private repos, issues, wikis, and the like. If you're okay with your project being "readable by all", public projects on Pivotal are still free. I'm mostly a consultant these days, leading small groups of junior or intermediate developers into a more productive, more mature, fully operational teams of senior software developers. One of the first things I teach folks is how to use a project management system... and why! It'll save your bacon if it's simple, effective, and reliable. With a few minutes of discussion about your project, I can probably help you select the right tool and service for your team. Let me know if I can help with that. Best of luck!