The larger the system, the harder it is to know 100 percent. Here are examples of technology use that I find to be an interesting addition to certifications and tests.
See my Level Knowledge here
Xamarin (Microsoft, Visual Studio)
Java, Kotlin (Google, Android Studio)
Cordova
React Native
Angular
Use style described by rules main language or rules in team. It can be used in name config.
Russian (Русский) - native
English - intermediate
Use CMS, ERP, plugins, e.t.c
Develop own specialize system
CSS
JavaScript
JavaScript Frameworks (Angular, React, Vue, e.t.c)
JavaScript Library (bootstrap, e.t.c)
ASP.NET
Google Ads
SMM (social media marketing): Facebook, Instagram, Twitter, etc.
SEM
UI/UX
All issues must be founded and fixed or marked as know errors. Use unit and other type tests. Use monitoring. Use emulate load test.
I found issues on Android platform (fixed by google team) and WPF.
Принципы тестирования (Russian)
MPV solutions may need refactor. Old code may be need refactor. Old project may be need replace with new technologies. Individual check.
Руководство по Скраму (Russain)
Google Cloud, course certificate: Google Cloud Platform Fundamentals for AWS Professionals
VANDERBILT UNIVERSITY, course certificate: Introduction to Programming with Matlab
ALMATY STATE POLYTECHNIC COLLEGE (website link)
SCHOOL #7
C#
Git
.Net
T-SQL