Knowing every programming language and tech stack isn't everything, but it helps to be aware of what's out there and having a healthy breadth and depth of knowledge in relevant tech. Here's a list of what I'm familiar with (not exhaustive)!
Next JS
React Native and Expo
Nest JS
Serverless
Firebase
DynamoDB
MongoDB
Git and GitHub
AWS
Docker
TypeScript
Python
Java
2021 MacBook Pro M1
VS Code