In a mixed market economy, what is a typical way the government can reduce unemployment

In a mixed market economy, one typical way the government can reduce unemployment would be: The government can pay for projects to create work.

In mixed market economy, both the government and the private sector could work together and influence the economy. 
For example, the government could hire a contractor fro private sector to build a bridge. This will not only improved the city's infrastructure but also provide a lot of construction jobs at the same time.