For some reason, I think this simple calculation is too naive. Surely it can't be that simple, could it? Perhaps, the cost to the company for hiring this new developer is going to be much more than $200,000? What other hidden monetary costs do I need to take care of before deciding the true effective cost of hiring a new developer?
2) How complex is the application and how specialized will the knowledge of building it be...or in other words what is your plan when that developers leaves the following year? Can you easily hire someone to take over or will it be difficult for someone to pick up on the work.