IT consulting
Where a workload runs is a decision, not a default.
Some systems belong on your own hardware. Some belong in the cloud. Most suppliers answer that question before they have heard it, because they sell one of the two. Here the decision is made per workload, and the team that makes it stays with the result.
Infrastructure and virtualization
Servers, virtualization, storage, backup, and disaster recovery. Capacity is sized against the workload in production rather than a reference architecture, and recovery procedures are tested before anything is allowed to depend on them. A restore nobody has run is not a backup.
Cloud and hybrid
Migration planning and execution, cloud infrastructure built and operated on an ongoing basis, and hybrid designs where part of the environment stays in house. Microsoft 365 and other SaaS platforms are configured, integrated with the directory, and administered. What belongs in house stays in house.
Software development
Applications built to requirement and integrated with the systems already in service. Where an existing platform covers most of a need, the engagement is the integration. Where nothing covers it, the application is built. Nothing that already works is rewritten to create a project.
Consulting and operational support
System administration and support, remote and onsite, together with the decisions that precede it: what to procure, what to retire, and what belongs in house. The retire list matters as much as the procure list, and it is the one most suppliers never write.