In vanilla X4 Foundations it is really hard to find highly-qualified crew members for your ships. Usually, it takes a long time before they acquire necessary skills and ranks in order to do their jobs really well.
This mod adds a huge number of hireable NPCs to the game stations with high levels of experience in different fields. There is even a separate recruitment center open for hiring such qualified personnel.
Now it will be really easy for you to take control of all your trade and mining operations, combat and boarding missions, and other activities that depend on the level of your crew experience.