Examine the critical role of strong backend API development strategies in scaling and streamlining applications, illustrated through a detailed case study by Growth Acceleration Partners (GAP). This document highlights how GAP tackled the challenge of managing massive data volumes using a microservices architecture. It outlines the design of APIs that efficiently interface between a document search application front-end and a large-scale database, addressing complexities such as data volume management and integration. The text delves into the use of REST and GraphQL for flexible, efficient data handling, and discusses GAP’s approach to creating scalable and manageable backend systems through microservice-based architectures.