The build-vs-buy decision is taught as binary. It hasn’t been binary for a decade. Configure-on-platform is now the third option for most enterprise needs.
Build: Custom code on infrastructure you own. Maximum flexibility; maximum cost.
Buy: SaaS vendor. Minimum flexibility; minimum cost.
Configure: Build on a platform (ServiceNow, Salesforce, Power Platform). Mid-flexibility; mid-cost.
Configure when: the workflow shape matches the platform’s opinions; you already pay for the platform; your needs may evolve in the same direction the platform evolves.
Build when: your differentiation is the workflow itself; configure-cost exceeds build-cost over a 3-year view; you have engineering depth.
Buy when: the workflow is undifferentiated commodity; vendors deliver it well; integration cost is manageable.
The default decision in most enterprises is “build” because that’s the model engineers know. Configure-on-platform delivers 80% of the value at 30% of the cost in most cases. Yet it’s often the last option considered.
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