1. A method implemented by a computing device of a particular information technology (IT) system, wherein the particular IT system is connected to another IT system, the method comprising: receiving, by the computing device, a transaction to be modeled as a workflow, wherein the workflow is a depiction of work of at least one person and includes a sequence of operations; creating, by the computing device, a particular system workflow based on the transaction; providing, by the computing device, the particular system workflow to at least one application programming interface (API) associated with the particular IT system; receiving, by the computing and via the at least one API, another system workflow associated with the other IT system; combining, by the computing device, the particular system workflow with the other system workflow to create a combined workflow, wherein the combined workflow includes a combination of the particular system workflow and the other system workflow; and enabling, by the computing device, a user device to access, via the particular IT system, one or more of the combined workflow, the particular system workflow, or the other system workflow.