GitHub's mobile applications have integrated GraphQL to enhance feature development efficiency by reducing engineering efforts and eliminating over-fetching, allowing the team to focus on creating user experiences rather than managing networking and API stability. The adoption of GraphQL, supported by the Apollo framework for iOS and Android, necessitates a shift from the traditional REST mindset to a schema-based approach where queries and mutations replace HTTP methods, allowing clients to specify their data needs without relying on predefined endpoints. This transition is facilitated by code generation, which simplifies the handling of network models and keeps them in sync with backend changes, while fragments ensure API consistency and reduce model redundancy by allowing reusable pieces of code. Although there are platform-specific differences in the Apollo GraphQL library implementations for iOS and Android, these do not significantly impact functionality, and efforts are underway to minimize these differences. Overall, GraphQL and Apollo's tooling contribute to rapid feature development by abstracting away many traditional mobile application concerns, allowing developers to leverage every part of network requests efficiently.