Scenario

You're advising an engineering leader who had to choose whether to build a core platform capability internally or adopt an external vendor. The decision affected product velocity, long term differentiation, and the team's ability to support future scale. Leadership wanted a clear recommendation that balanced speed, cost, control, and strategic value.

Question

Tell me about a time you had to make a build-vs-buy decision for a critical platform capability. How did you decide?

A strong answer can anchor on a platform capability such as observability, orchestration, feature storage, or internal developer tooling. For Lambda, a good example is deciding whether to build a first-party telemetry and observability layer for GPU jobs or integrate a third-party stack into the Lambda platform.