This is a difficult question to answer, as it depends on the level of experience of the junior developer in question. Generally speaking, however, Magento development can be quite complex and challenging, especially for those who are just starting out. There are a lot of moving parts to Magento, and it can be difficult to keep track of everything. Additionally, there is a steep learning curve when it comes to understanding Magento's code structure and architecture. So while it is certainly possible for a junior developer to learn and be successful with Magento, it may be more difficult than working with other platforms.