I know Nextjs and learned to do basic backend stuff with it. I also learned Nodejs and Express recently. My main goal is to land a job before 2025, I want to create project using the tech stacks that are much likely to be used in real life work.

I heard still lot of companies don't use Nextjs for backend and use Express. Do you think I should create my backend with Nextjs and MongoDB or I should create backend using Express? I want to be good at backend in one of those techs. What would you suggest?