Build vs. Buy: How to Actually Decide

Build vs. buy gets treated like a technology question, cost of development against cost of a subscription, but the more useful framing isn't really about technology at all. It's about what's actually core to the business, and what isn't.

The question that actually matters

Is this thing part of what makes the business genuinely different from its competitors, or is it a solved problem that every business in the category needs handled the same basic way? Payment processing, authentication, email delivery, these are rarely where a business's real advantage lives, and building them from scratch usually means spending real engineering time reinventing something a mature product already does well. The part of the product that's actually specific to how this business operates, that's usually where building makes more sense, because an off-the-shelf tool wasn't designed around this business's particular logic and probably never will be.

Where the "just buy it" instinct goes wrong

Off-the-shelf tools are genuinely fast to start with, and that speed is real. But they come with real constraints too, limits on customization, pricing that scales in ways that can surprise a growing business, and a dependency on someone else's roadmap for a piece of the product that might matter more to this specific business than it does to the vendor. None of that means don't buy it, it means go in knowing the tradeoff clearly instead of discovering it later.

Where the "just build it" instinct goes wrong

Building something that already exists, well, elsewhere, often costs far more in ongoing maintenance than it did to build the first version. That maintenance cost is easy to underweight at decision time, because it's spread out and invisible up front, unlike a subscription price that's right there on a pricing page.

How I'd actually approach it

Start by asking whether this specific piece is where the business's real value lives, or whether it's a solved problem the business needs handled well, not uniquely. That answer points toward build or buy far more reliably than comparing raw costs ever will.