Not very long ago, in my IT consulting career, I used to be responsible for the launch of mission-critical applications that help enterprises leap into the cutting edge of the digital business revolution. There were a lot of hard skills required for leading such a mission that involved getting the system architecture and software design right early, mentoring and managing the engineering resources, and tracking the progress to the satisfaction of the business analysts who put together the requirements and the stakeholders who funded the projects. Those skills, while hard, were largely deterministic and manageable vs another set of skills required to ensure that the built applications come alive in production environments, and run reliably and securely thereafter. This other set of skills often pit the application developers against the infrastructure administrators and InfoSec professionals.
Source: DevOps Journal