I would caution you against hiring junior developers.
Typically you hire junior developers for what they will become, and not where they currently are. That means the traits you're looking for is a desire to learn and genuine interest in technology.
If you only have junior developers, they will have a much tougher time learning. They'll never see how software should be built.
There are exceptions. Really simple prototypes is one of them. Some maintenance of existing projects might be another exception, depending on the quality of that project, and the type of work involved. Anything reasonably complicated, I wouldn't expect them to finish, and if they did finish, I'd expect it to need to be rewritten very early on.
If you want to do it right, hire a mid level or senior developer. It's better to have a single senior developer than 5 junior developers. If you're looking to hire multiple developers another choice would be to hire one senior developer and one junior developer. Just don't hire only junior developers.
Typically you hire junior developers for what they will become, and not where they currently are. That means the traits you're looking for is a desire to learn and genuine interest in technology.
If you only have junior developers, they will have a much tougher time learning. They'll never see how software should be built.
There are exceptions. Really simple prototypes is one of them. Some maintenance of existing projects might be another exception, depending on the quality of that project, and the type of work involved. Anything reasonably complicated, I wouldn't expect them to finish, and if they did finish, I'd expect it to need to be rewritten very early on.
If you want to do it right, hire a mid level or senior developer. It's better to have a single senior developer than 5 junior developers. If you're looking to hire multiple developers another choice would be to hire one senior developer and one junior developer. Just don't hire only junior developers.