To thrive as a REST API Developer, you need strong programming skills in languages such as Java, Python, or Node.js and a thorough understanding of RESTful architecture principles. Familiarity with tools like Postman, Swagger, and API security protocols, along with experience in cloud-based environments and relevant certifications, is often expected. Excellent problem-solving, communication, and collaboration skills help developers work effectively within cross-functional teams. These competencies are essential for designing, building, and maintaining scalable, secure, and user-friendly APIs that meet business and client needs.