The application architecture of online services often requires the orchestration of multiple APIs to retrieve data from various sources, such as inventory, reviews, and prices. This can lead to engineering challenges, increased costs, and slowing innovation due to cumbersome authentication and authorization credentials management. Apollo's GraphOS platform addresses these challenges by leveraging GraphQL and graph-based API orchestration, abstracting underlying data sources from clients, and providing a declarative approach to requesting data, which reduces the necessity for procedural code and optimizes API calls. By adopting this approach, developers can concentrate on solving business issues rather than generating boilerplate orchestration code, leading to significant enhancements in engineering efficiency.