I am using Magento2.3.0 community version When merge and minify js and css after set production mode not working my admin panel and front end css lacking if any one know what is actual issue reply me .I apply all command in our production side.
Magento 2 Backend option to merge and minify js are useless. Please try the advance bundling of js provided in magento 2 docs using nodejs and r.js
I'd you run static content deploy with different locales and show errors you might be able to see some errors
php -d display_errors=1 -d memory_limit=-1 bin/magento setup:static-content:deploy -f en_GB --theme Magento/luma
Replace luma with your theme and en_GB with locale you are using. Could be different between frontend and backend.