id: platform-developer
name: Platform Developer
aka:
  - Kubernetes Developer
  - Extension Developer
tags:
  - user-type
short-description: >
  A person who customizes the Kubernetes platform to fit the needs of their project.
long-description: >
  A platform developer may, for example, use [Custom Resources](/docs/concepts/api-extension/custom-resources/) or [Extend the Kubernetes API with the aggregation layer](/docs/concepts/api-extension/apiserver-aggregation/) to add functionality to their instance of Kubernetes, specifically for their application.  Some Platform Developers are also {% glossary_tooltip text="contributors" term_id="contributor" %} and develop extensions which are contributed to the Kubernetes community.  Others develop closed-source commercial or site-specific extensions.