You can autostart pimatic by additionally installing the init.d script:

wget https://raw.githubusercontent.com/pimatic/pimatic/v0.9.x/install/pimatic-init-d
sudo cp pimatic-init-d /etc/init.d/pimatic
sudo chmod +x /etc/init.d/pimatic
sudo chown root:root /etc/init.d/pimatic
sudo update-rc.d pimatic defaults

It should now start with:

sudo service pimatic start

and log the output to: pimatic-app/pimatic-daemon.log