Raspbian Jessie, autologin with custom user

/etc/systemd/system/autologin@service

...
ExecStart=-/sbin/agetty --autologin <username> --noclear %I $TERM
...

Disable:

ln -fs /lib/systemd/system/getty@.service \
 /etc/systemd/system/getty.target.wants/getty@tty1.service

Enable:

ln -fs /etc/systemd/system/autologin@.service \
 /etc/systemd/system/getty.target.wants/getty@tty1.service

Enable/Disable taken from: http://raspberrypi.stackexchange.com/a/38203