When an entrepreneur has three employees at a busy and growing software company, what is the primary responsibility of the entrepreneur?

To direct the employees and respond to any calls/emails regarding a problem or upgrade that should be changed/fixed. (I don't know if that's what you wanted)

in this situation the responsibilities of entrepreneur will include motivating his employees through different means These activities will include speaking to peers focused on how to start a business, moreover mentoring less experienced individuals, supporting trade associations, or engaging in volunteer activities of interest to the entrepreneur.