In a socialist regime, job assignments are made by the state. The state controls most industries and companies, and is responsible for assigning jobs to citizens. However, there may be corruption in the system where individuals in positions of power use their influence to give jobs and favors. It's important to note that the reality of socialist systems can vary significantly depending on the country or region in question and may have different characteristics than described.
But the basics of the corruption system is the same. In fact, low level officials traded jobs, cigarettes, food, for sex if it was a woman who wanted a favor or a job, and rubles if they were males, there are accounts of men giving their wives in order to obtain promotions, jobs, or moving to a another city.
In Venezuela as an example, or Cuba, it happens the same. Citizens don't deal with the State, they deal with low level officials who have the veto power. Basically you become a slave.