A method of implementing inter-component function calls. The method comprises generating a lower tier indirection data structure comprising an entry indicating a location in memory of a function within a first software component, a higher tier indirection data structure comprising an entry indicating a location in memory of the lower tier indirection data structure, and a configuration data structure comprising an entry defining an active version of the first software component. The method further comprises implementing executable computer program code for an inter-component function call by referencing entries within the configuration data structure, the higher tier indirection data structure and the lower tier indirection data structure.