An Integration Developer facilitates communication between diverse systems, designing and implementing solutions to allow interoperability. They work with APIs, ESBs, and other integration tools to establish seamless data flow between varying software applications. Their role includes understanding business requirements, designing integration architecture, coding, testing, and troubleshooting to ensure optimal system performance. They also maintain and upgrade existing integrations, ensuring data security, and collaborating with IT teams to improve system efficiency. Their expertise lies in languages like Java or .NET, and they need a solid understanding of SOA, SaaS, and cloud computing. They play a vital role in enterprise IT strategy.