It is very important that your website should have a sitemap so, the search engines can catch all your web pages and index their contents. If you order to a developer it is very important to check the final codes and especially the sitemap file. if you just add an /sitemap.xml to the end of your web app name you can see the sitemap file. for example https://hadicodes.com/sitemap.xml.
If you made a new article always check the sitemap and make sure that it is added to your sitemap.xml file If you use cms systems such as WordPress, Jumla, Drupal, etc. make sure that you have added and activated the sitemap plug-in and that it works properly. The search engines regularly check your web app sitemap and according to the changes, their bots get the content of the page and sort it out to show in their searches result.