The Return of Custom Software: Why the Post-SaaS Era Looks a Lot Like 2005

The build-versus-buy debate is shifting again. AI-assisted development has dramatically reduced the cost and time required to build custom software, eroding the four core advantages that made SaaS dominant: high development cost, slow time-to-value, maintenance burden, and scarce talent. Industry data shows 90%+ of dev shops now use AI tools, with leading teams reporting 3x–10x productivity gains. A new framework is proposed: buy for commodity problems, build when workflows are a competitive differentiator or proprietary data is central, and adopt hybrid approaches for systems of record. For software delivery organizations, this means shifting to small senior AI-augmented teams, outcome-based pricing, and faster delivery cycles. The result is a post-SaaS era where competitive moats shift back to enterprises that own their custom-built systems.