Build vs buy is back on every board agenda — not because SaaS tools got worse, but because AI changed what custom software can do in months instead of years. The wrong frame is 'cheap SaaS vs expensive custom.' The right frame is 'where is differentiation, and where is commodity?'
Buy when
- The workflow is industry-standard — email, accounting, generic CRM.
- Compliance and integrations are the vendor's core competency.
- Speed to first value matters more than unique UX.
- Your team should not maintain infrastructure for this domain.
Build when
- The product IS your company — proprietary workflows, data models, or AI logic.
- Off-the-shelf tools force compromises your best customers refuse.
- You need white-label or multi-tenant delivery as a business model.
- Integration tax across five SaaS tools exceeds build cost within 18 months.
The third path: build on a dedicated partner
For many scale-ups, the answer is neither pure buy nor hire-50-engineers build. It is partnering with a product engineering team that ships custom SaaS on a managed cadence — you keep IP and differentiation; they bring velocity, AI-native patterns, and ops maturity.
Quick test
If a competitor could buy the same tools and catch up in 90 days, you should build the moat — or build the workflow layer on top of commodities.
