Java, Python, React, and TypeScript are the most commonly used programming languages among Software Developers. However, depending what type of Software Developer you are, you may want to pick up skills in other languages.
Front End Developers mostly focusing on the design aspect tend to have React, Angular, Vue, JavaScript, HTML, and CSS in their arsenal, while Back End Developers working on coding and integration typically use .NET, C#, SQL, Java, PHP, Python, AWS, Azure, CI / CD. Full Stack Developers will use a combination of both.