The Identity Manager job service uses System.Net.HttpListener for the web interface. With the job service configuration tool (JobServiceConfigurator.exe), it's possible to set whether to use SSL or not ("Use SSL" in the configuration section.)
System.Net.HttpListener can be configured to use a certificate for certain ports using HttpCfg.exe.
Please refer to How to: Configure a Port with an SSL Certificate for further information.
For more information on configuration the job service, please refer to the Installation Guide: Installing and Configuring the One Identity Manager Service.