Platform Engineering ROI: What it costs to build your own platform

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What it actually costs to build your own internal developer platform over five years, and why most “we’ll just build it” pitches are pricing the cheap version.

Sixty people and $7.5 million a year, every year, is what it costs to build and operate your own internal developer platform if you do it the way most enterprises end up doing it, and most of the executives signing off don’t see the number, because it’s spread across multiple cost centers under “engineering.”

The cheap version of the pitch they hear — one team, weekend work, a control plane with a bit of YAML on top — ships v1 and turns into the maintenance burden nobody wants to own. The version that actually works is a sixty-person product engineering organization, indefinitely. The numbers below come from a recent VMware Tanzu Platform paper I helped update, so flavor it with a vendor-salt up front if you feel like you need to. But the staffing structure is good enough to think through.

The weekend project that turned into a 60-person infinite financial commitment

From what I’ve seen, if you align your platform team with something that feels like the CNCF platform reference architecture, you end up with about seven product teams: infrastructure, operations, deployment, runtime and middleware, database, security, and coaching/developer enablement. Each team is a mythic two-pizza team, 7–9 engineers. There’s no personal pan pizzas when it comes to building your own platform. Shake a couple of scrum masters and product owners on top to coordinate and manage, and you’ve got about 60 people total. At a …

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