Using the SharePoint 2013 Product Catalog feature, you can create a job postings board for your organization in minutes.
SharePoint and Project can work together, facilitating a collaborative project team to plan and manage a project. Using SharePoint’s task list along with Project makes it easy to involve the team and communicate task information.
You can use a SharePoint Community Site to provide a place where different people gather to discuss and share knowledge on a topic of interest. One use, as I describe here, can host a new employee onboarding community.