I've worked with both Microcontrollers and Servers alike.
I have experience developing backend software that interfaces with databases like MariaDB, SQLlite, Amazon's DynamoDB, and have experience normalizing data and creating databases that last.
C++, C, Java, Golang, PHP, Python, Rust, Dart, and even assembly are some of the languages I am performant in, and I have been working with C++ for over 10 years, alongside Java.
I've done plenty of Front-end related projects as well. I've made web applications using React, I've made projects with Express.js and Spring alike, and have made several applications using flutter.
I also have experience working with Dart, Swift, Kotlin, and whatever the stack is on QT. (I mean, what is the stack on QT? QML??? C++? Python? Does anyone know???)
I've also got a lot of experience developing user experiences with no framework at all! I'm skilled with OpenGL, SDL, or just straight up rendering to a framebuffer. As long as it has pixels, I can render to it.