A junior should already be familiar with CS & programming concepts. Where they need help is knowing when and where to apply them. If your company does code revi

A junior should already be familiar with CS & programming concepts. Where they need help is knowing when and where to apply them. If your company does code reviews this is a good place to teach about best practices. Likewise they should know that if they're stuck for more than N hours (say N=3) they should ask you for help. When they ask for help, don't just feed them the answer. Show them how you find the answer (e.g. running a debugger, looking up documentation, doing a Google search for the error code etc).