An API Integration Developer designs, implements, and maintains API integrations between various software systems. They create API interfaces that facilitate communication between different software applications, ensuring seamless data exchange. This role involves understanding the functionality of various APIs, troubleshooting integration issues, and optimizing performance. They work with various languages like Python, Java, or .NET, and tools like Postman or Swagger. Besides, they collaborate with other developers, clients, and stakeholders to understand integration needs, develop solutions, and provide ongoing support. They also ensure API security and manage updates or changes to the APIs. Their work is crucial in creating interconnected and efficient systems.