Sorry but that's a silly question. There is no limit to how complex you can make anything in any development environment. The less competent a developer is, the

Sorry but that's a silly question. There is no limit to how complex you can make anything in any development environment. The less competent a developer is, the more complex the solution will be. What is hard, what takes skill, is to find a simple solution to a complex problem. Having said that, back end applications can be anything from a simple DB server to the control software of a nuclear reactor or factory. So there is more scope for back end development to be complex than there is for front end development. So perhaps an answer is that the back end development is more likely to be more complex than the front end development.