A Rust developer is a software engineer specializing in the Rust programming language, known for its focus on safety, concurrency, and performance. They are adept at building reliable and efficient software systems, particularly where memory safety and high performance are critical, such as in systems programming, web servers, and blockchain technologies. Rust developers are highly valued in industries requiring robust and secure applications, often working for companies focused on high-performance computing, embedded systems, and cloud services.

A COBOL developer specializes in using the COBOL (Common Business-Oriented Language) programming language to design, develop, and maintain business-oriented applications. COBOL is a high-level programming language first developed in the 1950s and widely used in business, finance, and administrative systems for companies and governments.

A game developer is a professional involved in the creation and development of video games. They work on various aspects of game design, including programming, art, animation, storylines, and gameplay mechanics, utilizing tools and software specific to game development. Game developers are essential for the gaming industry, catering to a broad audience ranging from casual gamers to hardcore enthusiasts across various platforms such as consoles, PCs, and mobile devices.