An Application Infrastructure Design Developer designs, builds, and maintains the frameworks and systems that serve as the foundation for applications. They have a strong understanding of network architecture, server setup, and database design, and they work closely with software developers to ensure that the infrastructure supports the needs of the applications. They also manage security protocols and disaster recovery plans, ensuring that the infrastructure is resilient and secure. Additionally, they monitor system performance, troubleshoot issues, and continually optimize the infrastructure for efficiency and scalability. They also stay updated with the latest technologies to ensure the infrastructure is up-to-date.