An IBM SoftLayer developer works on IBM's cloud computing infrastructure, known as SoftLayer. They design, code, test, and debug applications or enhancements within SoftLayer's system. Their tasks include developing software solutions, integrating applications with SoftLayer's core infrastructure, and maintaining and improving existing software. They also collaborate closely with other team members and stakeholders, ensuring SoftLayer's services meet business requirements and user needs. These developers may also be involved in troubleshooting and resolving issues, ensuring optimal system performance and stability. They need to stay updated on current technologies and apply them to improve SoftLayer's infrastructure and services.