Set the name of the service you'd like to remove as a shell variable then run the following script:
SERVICE_NAME=someApp.serviceRun this:
systemctl stop $SERVICE_NAME ; \
systemctl disable $SERVICE_NAME ; \
rm /etc/systemd/system/$SERVICE_NAME ; \
rm /usr/lib/systemd/system/$SERVICE_NAME ; \
systemctl daemon-reload && \
systemctl reset-failed