Analysis of Internal Developer Platform Costs: Build vs. Buy

The True Cost of Building an Internal Platform

Enterprises building their own internal developer platforms typically incur an annual cost of $7.5 million, supporting a team of 60 individuals. This figure often goes unnoticed by executives because the expenses are distributed across various engineering cost centers. The initial perception of a low-cost, small-team project frequently evolves into a substantial, ongoing financial commitment.

Staffing Requirements for In-House Development

An internal platform team, aligned with a CNCF platform reference architecture, often comprises about seven product teams: infrastructure, operations, deployment, runtime and middleware, database, security, and coaching/developer enablement. Each team typically consists of 7–9 engineers, along with scrum masters and product owners, totaling around 60 people. At a conservative salary of $125,000 per engineer, the payroll alone amounts to $7.5 million annually. Over five years, this accumulates to $37.5 million in payroll for the platform team, excluding application development costs.

Cost Comparison: Build vs. Buy

In contrast to building, enterprises that opt for commercial platforms allocate staff primarily for platform operation, which requires fewer personnel. Data collected indicates significantly lower operational staff ratios for commercial platforms. For example, some organizations manage 6,500 developers with 16 operations staff, or 350 applications with 7 operations staff. These reduced staffing needs contribute to lower overall costs compared to the extensive teams required for in-house platform development and maintenance.