The strategic decision framework for whether to develop custom technology in-house or purchase an existing commercial solution.
The question gets framed as two choices: write the code yourself or buy someone else’s product. Both options are real, but the binary misses at least two others that matter more in practice. Build means custom software from scratch. Buy means a commercial platform. Configure means adapting an existing platform through its native tools without writing code. Compose means assembling a solution from specialized tools connected through APIs.
Most martech decisions land in the configure or compose category. A marketing team that needs a lead scoring model isn’t choosing between building one from scratch and buying an entire platform. They’re configuring the scoring module in their existing MAP, or composing a solution from their CDP’s segment builder and their automation platform’s workflow engine.
Where the conversation consistently breaks down is the timeline. Build vs buy overweights the initial decision and underweights what happens in year two. Commercial software comes with a vendor that ships updates, patches security holes, and maintains documentation. Custom software depends on the people who wrote it.
Every custom build should answer one question before a line of code is written: who maintains this when the person who built it moves on? If the answer is a specific person’s name, the organization is building a fragility, not a capability.