Engineering
When to build vs. buy software
Uplix Team Jan 15, 2026 8 min read
Default to buy for undifferentiated heavy lifting
Authentication, payments, analytics, email, and hosting are all solved problems. Buying these lets you focus engineering time on the parts of your product that only you can build.
Build when it is a core differentiator
If the feature is the reason a customer chooses you, build it. If it is the reason a customer stays, own it. Core IP should never live on a vendor roadmap.
Run a 90-day cost forecast
The sticker price of a SaaS tool is rarely the total cost. Factor in setup, training, integration, and the opportunity cost of slower iteration. A custom build can be cheaper over three years if the team is already deep in the domain.
Account for hidden integration tax
Every third-party tool has edge cases, rate limits, and unexpected API changes. Budget a maintenance line item for every integration. If the tax is high, the case to build gets stronger.
