I am trying to find outsourcing firms that can provide steady software development work to my firm on commission basis. Is there a platform for this?

Not necessarily, if your app can potentially serve different markets with different demographics, it may be beneficial to market to each market individually. Since app interface often serves as a marketing tool, it is important that it resonates with its target audience. This means having a different interface for the same set of functionalities depending on your audience may be prudent. On the contrary, if you are simply trying to create variations of the app for a single market by short-cutting user testing and hoping that one of the interfaces will generate more interest, you are then over-saturating the market and may actually hurt yourself by creating unnecessary confusion for your users. I would suggest looking into what other apps your target audience is using and working off that to create a single user experience which would resonate with them. My name is Michael and I am an Entrepreneur, Adviser and Innovator in a Small Business and Technical Solutions arena. I'd be happy to offer you additional assistance if you are interested.

Assuming you have actually identified someone in this role and you're asking about the legal side of things, I'd say that beyond a legal entity by which to enter into an employment or contractual agreement that has the standard assignment of rights, confidentiality, etc, you're probably fine for now. Depending on where you're operating from and whether you actually have an actual office or not might impact your need for a business license. But if you're asking how you would actually identify this person, that's a much different answer. The reality of it is that unless you have already raised or can self-fund a full-time salary of an iOS developer (which will range $85,000- $140,000 for just salary anywhere in North America depending on experience and location), you're better off looking at a mobile development agency. Also, many great iOS developers lack strong back-end skills, so in order to publish an app, you're likely looking for two engineers, not one. Those that pass themselves off as "full stack" are usually marginal at both. So either you have to be able to show that you have raised or can self-fund two people's salaries for a year, or you won't be able to attract full-time talent. Also, I haven't mentioned anything about design, which depending on the nature of the app, would require a third person at least on contract to design and iterate the user experience. In most cases, non-technical founders that want a product built should find a reputable mobile agency to build the first version of their app. I know of several and am happy to provide further information, if you're serious about building your app. Beyond the cost of building a single platform app with a contractor (I would budget $50k at a minimum), you should also be sure you have at least $50k in customer acquisition budget comfortably allocated and that's just to take a "realistic shot" at having an app get any traction. So if you can't raise or spend USD $100,000, I would say that as a non technical founder, you're better off pursuing a different line of business. That's just the reality of the mobile app marketplace today.

I believe Appannie.com is what you are looking for.

Unfortunately, in most cases where a transition occurs between contract developers prior to a shipped product, it's almost *always* the case that the new developer starts the code largely from scratch. When problems dictate a required transition to a new developer, it usually means that the previous developer left enough of a mess (in the codebase) that no good developer would want to try to waste your money and their time cleaning up the mess. Happy to talk with you about your current predicament and offer you advice based on more information.

It's generally not worth supporting additional languages at launch. Why add extra work when you don't even know if the network will take-off in English? Best to minimize the complexity for launch.