> become a solid programmer with specialization in front-end technologies. Sure. In this case I would write that as "Software Developer with experience in Java

> become a solid programmer with specialization in front-end technologies. Sure. In this case I would write that as "Software Developer with experience in Javascript, HTML, CSS, and React". Well... You could probably replace that with "Frontend Developer with experience in React". Except that React is a frontend framework, so you might as well simplify that as "React Developer". And now we're back where we started.