GraphQL

GraphQL is a query language and runtime for APIs that enables clients to request precisely the data they need, developed by Facebook to address limitations of REST APIs in mobile and frontend development. Job listings requiring GraphQL typically come from companies building complex frontend applications, mobile apps, or developer platforms where flexible data fetching reduces round trips and improves performance. Backend engineers are expected to design GraphQL schemas with proper types and resolvers, implement efficient data loading patterns like DataLoader to avoid N+1 queries, and handle authorization at the field level. The technology's strongly-typed nature enables powerful developer tooling, automatic API documentation, and contract-first development workflows. Roles often involve integrating GraphQL gateways with existing microservices, implementing pagination and caching strategies, and balancing schema flexibility against performance concerns. Companies adopting GraphQL typically have frontend-heavy architectures where multiple clients consume the same backend, or are building developer-facing APIs where introspection and type safety provide significant value over traditional REST endpoints.