Google Summer of Code (GSoC) is an annual, international, program which encourages college-aged students to participate with open source projects during the summer break between classes.
Students accepted into the program receive a stipend, paid by Google, to work well-defined projects to improve or enhance the Jenkins project. In exchange, numerous Jenkins community members volunteer as "mentors" for students to help integrate them into the open source community and succeed in completing their summer projects.
Public Google Group: https://groups.google.com/forum/#!forum/jenkinsci-gsoc-all-public
To start, you need a Google or Gmail account
After clicking above link, a "Sign in" button appears in top-right of page
After sign in, a "Join group" button appears in middle of page
To learn more about joining a Google Group, please see https://support.google.com/groups/answer/1067205
There is a weekly GSoC SIG project meeting, which happens at 2PM UTC on Wednesdays. The meetings are usually recorded, and we post links in our gitter channel before the meeting starts. You can find recording of office hours here.
Although we use mailing lists as the main communication channel, we also define regular timeslots aka "office hours". During these timeslots Jenkins GSoC org admins and mentors will be also available in the Gitter channel. Video calls will be conducted on-demand.
In addition to these meetings, each GSoC project has regular meetings during community bonding and coding phases. See the project pages for the schedule.