Software-as-a-service (SaaS) and low-code platforms are transforming how companies think about build-versus-buy software-sourcing decisions. Application development and delivery (AD&D) pros now have powerful, quick tools for extending SaaS solutions — and for building wholly new modules based on these platforms. The upside: fast delivery of new capabilities, acceleration of business results, and new sources of innovation. The downside: compromised app upgrades, slower app changes, and rising costs. AD&D professionals should read this report to understand how to implement a buy-then-build strategy for SaaS and avoid its pitfalls.