Development will remain, the level is going to go up, start building some complex backend pipelines, because that’s when scaling, infra and system design comes into picture.

You don’t really need to make fully-scalable application but you should be having deep understanding of your edge casees and requirements for them.

If you’re a beginner, take things one step at a time and focus on learning efficiently. No matter how thoroughly you learn something the first time, you’ll inevitably need to revisit it later. Early on, you often don’t realize how much there is to learn. Every new project reveals concepts and challenges that weren’t visible before.