Build vs buy

Build vs buy: when DIY beats SaaS at scale

Build-vs-buy isn't a values debate, it's a breakeven date. SaaS wins early because it converts a big upfront build into a small monthly fee. DIY wins once your usage-based SaaS bill exceeds the fully-loaded cost of owning the code — typically around month 18 for infrastructure-style tools. This piece gives you the formula, a worked example, and the three traps that make teams build too early.