In a purely socialist society, how would a company hire more workers?

Im assuming the definition of socialism as:

The workers own the means of production.

To me, this means that every employee would have equal shares of a company.

Ill outline a few scenarios, maybe you guys can tell me how you see this working.

1. 3 guys run a podcast together. They bought all the equipment and rent the studio that they record in, but they want to hire a janitor to clean up at nights for them. Does the janitor get equal shares of the company?

2. 500 people work in a textile company that makes the finest silks in the land. They want to expand their business. They think that they will need 1000 new workers in the next year to meet the demand for their silks. How do the 500 workers hire 1000 more workers? Do they need to take a pay cut or lose their shares in the business to give them to the new workers?

3. In a socialist restaurant, one waiter is a super hard worker who remembers all the customers orders, is always on time, always smiling, very fast and efficient. Another worker is always late, smokes weed behind the store most days, always mad, yells at customers, is not fast or efficient. When the business gains more employees, do they take shares from everyone even though some employees are more valuable than others?

Just for context, im a liberal and a capitalist (i believe that individuals should invest their time and capital into work that will generate profit for themselves and others), but i am curious about how other economic systems could he laid out. I feel like my world view could potentially be clouded by the fact that it has always been this way, so I cant picture other ways for a system to work.