Sometime your programmers hide full admin access from you. When they handover a project he feel some doubt that maybe the person cheated us or he want to keep you bound for future work without his support you are unable to do anything in a backend because of limited restriction upon your user. For Example you will be unable to access the following features in WordPress.
Backend Restricted or hidden features
Unable to login WordPress backend.
New plugin installation restricted
New User creation restricted or hide
Visual Editor / Builder Editing Problem in pages and posts.
Password change problem
Theme Modification Not showing.
Widget Not working or hide
Pages not showing
Wordpress settings and customization is hide.
Superuser / Administrator Access Restricted or hide
Woocommerce Categories restricted Woocommerce Add product not working
Woo-commerce new shop restricted.
Many More options like this can be restricted. don't worry for any data loss feel free to contact. I will solve any matter related to your backend.